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math exercise (no prize for this :)

Posted By: Bob Koca
Date: Tuesday, 10 May 2011, at 12:58 a.m.

In Response To: math exercise (no prize for this :) (Joe Russell)

"The chances of not getting a correct pick is 7279/7280. (7279/7280)^5046 = .5 You would need 5047 different entries to have more than a .5 chance of hitting."

In your calculation you were not assuming that the entries would all be different. If you were the calculation would instead be (7279/7280) X (7278/7279) X (7277/7278) ... X )(7279 - N)/(7280 - N))

An easier way though would be just to multiply the number of different entries times the (1/7280) chance that any particular one hits.

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