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Every day a certain bank calculates its average daily [#permalink]
30 Mar 2005, 21:52

Every day a certain bank calculates its average daily deposit for that calendar month up to and including that day. If on a randomly chosen day in June the sum of all deposits up to and including that day is a prime integer greater than 100, what is the probability that the average daily deposit up to and including that day contains fewer than 5 decimal places?

calculating each one needs 4mn at least even with the fact that I took 200 as an easy number to calculate, found around 7-8-9 out of 30 days and by re-checking the suspicious one I've found 9 ways but I may be wrong on this one...