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the probabilities that 3 friends A,B andC pass a driving test are1/3,1/4,2/5 respectively.All 3 take the test find the probability that(a)aa 3 failed the test (b) only B passes the test(c) only 2 of them pass the test (d)at least 1 passes the test...

I will do one. Assuming the events are independent...

Prob (all fail)=Prob(Afails)*prob(bfails)*prob(cfails)
= 2/3 * 3/4 * 3/5

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