knowledge-route Maths10 Cha7
title: “Lata knowledge-route-Class10-Math1-2 Merged.Pdf(1)” type: “reveal” weight: 1
ARITHMATIC PROGRESSIONS
ARITHMATIC PROGRESSIONS
6.1 PROGRESSIONS : Those sequence whose terms follow certain patterns are called progression. Generally there are three types of progression.
(i) Arithmetic Progression (A.P.)
(ii) Geometric Progression (G.P.)
(iii) Harmonic Progression (H.P.)
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6.2 ARTHMETIC PROGRESSION :
A sequence is called an A.P., if the difference of a term and the previous term is always same. i.e.
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Ex. 1 Find the common difference of the following A.P. : 1,4,7,10,13,16 ……
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Sol.
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6.3 GENERAL FORM OF AN A.P.:
If we denote the starting number i.e. the
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Ex. 2 Find the A.P. whose
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Sol.
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6.4
Let A.P. be
Then, First term
Second term
Third term
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Ex. 3 Determine the A.P. whose their term is 16 and the difference of
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Sol. Given:
Put
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Ex. 4 Which term of the sequence 72, 70, 68, 66, ….. is 40 ?
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Sol. Here
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Ex. 5 Is 184, a term of the sequence 3,7,11,…. ?
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Sol. Here
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Ex. 6 Which term of the sequence 20,
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Sol. Here
Let
i.e.
Since, 28 is the natural number just greater then
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Ex. 7 If
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Sol.
Now, L.H.S.
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Ex. 8 If
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Sol. Let
Then,
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Ex. 9 If the
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Sol.
&
Solve (i) & (ii) to get
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Ex. 10 If the
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Sol.
By solving (i) & (ii)
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6.5
Let ’
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Ex. 11 Find
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Sol.
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6.6 SELECTION OF TERMS IN AN A.P. :
Sometimes we require certain number of terms in A.P. The following ways of selecting terms are generally very convenient.
No. of Terms | Terms | Common Difference |
---|---|---|
For 3 terms | ||
For 4 terms | ||
For 5 terms | ||
For 6 terms |
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Ex. 12 The sum of three number in A.P. is -3 and their product is 8. Find the numbers.
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Sol. Three no. ’s in A.P. be
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6.7 SUM OF n TERMS OF AN A.P. :
Let A.P. be
Then,
also,
Add (i) & (ii)
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Ex. 13 Find the sum of 20 terms of the A.P. 1,4,7,10…..
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Sol.
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Ex. 14 Find the sum of all three digit natural numbers. Which are divisible by 7.
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Sol.
Find
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6.8 PROPERTIES OF A.P. :
(A) For any real numbers
(B) If any
(C) If a constant term is added to or subtracted from each term of an A.P. then the resulting sequence is also an A.P. with the same common difference.
(D) If each term of a given A.P. is multiplied or divided by a non-zero constant
(E) In a finite A.P. the sum of the terms equidistant from the beginning and end is always same and is equal to the sum of
(F) If three numbers
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Ex. 15 Check whether
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Sol.
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DAILY PRACTIVE PTOBLEMS 6
OBJECTIVE DPP - 6.1
1.
(A)
(B)
(C)
(D)
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Que. | 1 |
---|---|
Ans. | B |
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2.
(A)
(B)
(C)
(D)
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Que. | 2 |
---|---|
Ans. | A |
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3. If
(A)
(B)
(C)
(D)
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Que. | 3 |
---|---|
Ans. | B |
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4. Which term of the sequence
(A)
(B) 100 th
(C)
(D)
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Que. | 4 |
---|---|
Ans. | B |
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5. Which of the following sequence is an A.P.
(A)
(B)
(C)
(D)
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Que. | 5 |
---|---|
Ans. | A |
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6. If the
(A)
(B)
(C)
(D)
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Que. | 6 |
---|---|
Ans. | C |
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7. The interior angles of polygon are in A.P. if the smallest angles be
(A) 8
(B) 10
(C) 9
(D) 6
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Que. | 7 |
---|---|
Ans. | C |
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8. In the first, second and last terms of an A.P. be
(A)
(B)
(C)
(D)
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Que. | 8 |
---|---|
Ans. | C |
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SUBJECTIVE DPP - 6.2
1. Is 51 a term of the A.P.
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Sol. 1
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2. Find the common difference of an A.P. whose first term is 100 and the sum of whose first six terms is five times the sum of the next six terms.
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Sol. 2
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3. Find three number in A.P. whose sum is 21 and their product is 336.
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Sol. 3
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4. A student purchased a pen for Rs. 100. At the end of 8 years, it was valued at Rs. 20. Assuming the yearly depreciation is constant amount, find the annual depreciation.
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Sol. 4
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5. The fourth term of an A.P. is equal to three times the first term and the seventh term exceeds twice the third by one. Find the first term and the common difference.
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Sol. 5
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6. Which term of the sequence
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Sol. 6
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7. If
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8. Find the sum of all the three digit numbers which leave remainder 2 when divided by 5 .
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Sol. 8
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9. Find the sum of all two digit odd positive numbers
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Sol. 9
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10. Find the
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Sol. 10
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11. 200 logs are stacked in the following manner: 20 logs in the bottom row, 19 in the next row, 18 in the row next to it and so on. In how many rows the 200 logs are placed and how many logs are in the top row ?
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Sol. 11
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12. The sum of the first
[CBSE - 2004]
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Sol. 12
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13. Find the sum of the first 25 terms of an A.P. whose
[CBSE - 2004]
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Sol. 13
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14. Find the number of terms of A.P. 54, 54, 48….. so that their sum is 513 .
[CBSE - 2005]
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Sol. 14
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15. In an A.P., the sum of first
[CBSE - 2006]
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Sol. 15
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16. Which term of the arithmetic progression
[CBSE - 2006]
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Sol. 16
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17. The first term, common difference and last term of an A.P. are 12, 6 and 252 respectively. Find the sum of all terms of this A.P.
[CBSE - 2007]
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Sol. 17
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18. Write the next term of the
[CBSE - 2008]
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Sol. 18
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19. The sum of the
[CBSE - 2008]
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Sol. 19