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OpenStudy (stanleysevens):
Given 7 coins, and 4 of them are red and 3 of them are blue. What is the probability that you choose red coin?
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OpenStudy (welshfella):
= number of red coins / total number of coins
OpenStudy (ben00):
Yeah, its easy.
OpenStudy (stanleysevens):
@welshfella , thank you, what about this. How much coins you must take until you get first red coin so that probability is more than 90%
OpenStudy (stanleysevens):
out of this 7 coins
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