How many "Black keys" are there on a standard grand piano?

How many "Black keys" are there on a standard grand piano?

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A standard grand piano has a total of 88 keys, 52 of which are white and 36 black. The black keys are arranged in groups of two and three, with groups of three separated by groups of two. Black keys are also used to denote sharp or flat musical notes, sharp notes are represented by black keys to the right of the white key, and flat notes are represented by black keys. . white key

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