passpadi

2018

Mathematics

JAMB

The probabilities that John and James pass an examination are 3/4 and 3/5 respectively. Find the probability of both boys failing the examination.

A.

1/10

B.

2/10

C.

9/20

D.

11/20

Correct Answer: 11/20

Explanation

Pr(both John and James passed) = 3/4 x 3/5 = 9/20 Pr(john and james failed)= 1-Pr(john and james passed) = 1 – 920 = 11/20

Pr(both John and James passed) = 3/4 x 3/5 = 9/20 Pr(john and james failed)= 1-Pr(john and james passed) = 1 – 920 = 11/20
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