Probability 1 Question 10

18. Consider the system of equations

ax+by=0,cx+dy=0

 where a,b,c,d0,1

Statement I The probability that the system of equations has a unique solution, is 3/8.

Statement II The probability that the system of equations has a solution, is 1 .

(2008,3M)

Passage Based Problems

Passage

Box I contains three cards bearing numbers 1,2,3; box II contains five cards bearing numbers 1,2,3,4,5; and box III contains seven cards bearing numbers 1,2,3,4,5,6, 7. A card is drawn from each of the boxes. Let xi be the number on the card drawn from the i th box i=1,2,3.

(2014 Adv.)

Show Answer

Answer:

Correct Answer: 18. (b)

Solution:

  1. The number of all possible determinants of the form

|abcd|=24=16

Out of which only 10 determinants given by

|1111|,|0000|,|1100|,|0011|,|0101|,|1010|,|1000|,|0100|,|0010|

Vanish and remaining six determinants have non-zero values. Hence, the required probability =616=38

Statement I is true.

Statement II is also true as the homogeneous equations have always a solution and Statement II is not the correct explanation of Statement I.



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक