Sequences and Series 5 Question 11

2. If the positive numbers a,b,c,d are in AP. Then, abc,abd,acd,bcd are

(2001, 1M)

(a) not in AP/GP/HP

(b) in AP

(c) in GP

(d) in HP

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Answer:

Correct Answer: 2. (d)

Solution:

  1. Since, a,b,c,d are in AP.

aabcd,babcd,cabcd,dabcd are in AP.

1bcd,1cda,1abd,1abc are in AP.

bcd,cda,abd,abc are in HP.

abc,abd,cda,bcd are in HP.



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