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Probability question

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excal:
There's a long winded way of doing it by using the binomial c.d.f, given that they are all indepedent (such that your joint probability will be Pr(first) x Pr(second) .. x Pr(last)).

That is to find probability of Pr(X >= 25) x Pr(Y >= 25) ...

Then modifying X to 24, 23, 22, 21, 20 and adjusting for all combinations of Y, Z and A (2nd - 4th die).

Rinse and repeat for Y, Z and A.

Ahmad's method looks better, but I don't understand it.

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