Q62,Paper 3,D12. A program P calls two subprograms P1 and P2. P1can fail 50% times and P2 40% times. Then P can fail

(A) 50%

(B) 60%

(C) 10%

(D) 70%.

Answer D.

Explanation.

(1-.5)(1-.6)=.3

Probability of working  complete program is 30%. So probability of failure is 70%.