self Maths Puzzle

If the probability that X will live 15 year is 7/8 and that Y will live 15 years is 9/10, then what is the probability that both will live after 15 years?

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REQUIRED PROB=(7/8)*(9/10) i.e 63/80
10 years agoHelpfull: Yes(0) No(0)

self Other Question

There are three events A, B and C, one of which must and only can happen. If the odds are 8:3 against A, 5:2 against B, the odds against C must be? Four boys and three girls stand in queue for an interview. The probability that they stand in alternate positions is?