There are 8 positive numbers and 6 negative numbers 4 numbers are chosen at random and multiplied Fi...........

Quantitative Aptitude ( CCS) Probability

There are 8 positive numbers and 6 negative numbers. 4 numbers are chosen at random and multiplied. Find the probability that the product is a positive number ?

1001/505

1/5

505/1001

450/965

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Explanation:

Answer
505/1001
Explanation :
14C₄ = 14*13*12*11/4*3*2*1 = 1001
4 No positive+4 no negative + (2 no positive * 2 no negative)
= 6C₄ + 8C₄ +(6C₂ ×8C₂) = 15+70+15*28 = 505
P = 505/1001