self Maths Puzzle


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?

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self Other Question


If five dice are thrown simultaneously, what is the probability of getting the sum as seven?

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?