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22 June, 05:32

There are 52 white keys and 36 black keys on a standard piano. What is the probability that if a person did not look and hit the keyboard twice that he or she would first hit a white key and then hit a black key?

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  1. 22 June, 08:34
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    The probability of her hitting a white key first is 52 out of 88 (13/22) and from black keys, it would be 36 out of 88 (9/22)
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