The probability of success of three students X,Y and Z in the one exa…

Question

The probability of success of three students X,Y and Z in the one examination are 15 , 14 and 13 respectively. Find the probability of success of at least two.

Accepted Answer

Option A. 16. Answer & Solution Answer: Option A Solution: P(X) = 1/5, P(Y) = 1/4, P(Z) = 1/3 Required probability: = [ P ( A )P ( B ) \ 1 - P ( C ) \ ] + [ \ 1 - P ( A ) \P ( B )P ( C ) ] + [ P ( A )P ( C ) \ 1 - P ( B ) \ ] + [ P ( A )P ( B )P ( C ) ] = [ 1/4 × 1/3 × 4/5 ] + [ 3/4 × 1/3 × 1…