Answer :

(i) Let us assume the event which is failed by A is denoted by EA

And, event which is failed by B is denoted by EB

It is given in the question that,

Event failed by A, P (EA) = 0.2

Event failed by both,

And, event failed by B alone

0.15 = P (EB) – 0.15

P (EB) = 0.30


= 0.5

(ii) We have,

Probability where A fails alone

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