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Mathematics 14 Online
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?

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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