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12 November, 15:58

There are (n r) different linear arrangements of n balls of which r are black and n-r are white. give a combinatorial explanation of this fact

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  1. 12 November, 16:30
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    Linearly arranging r black balls and (n-r) white balls, can be considered as picking r places for the black balls among the n places, and the white ball would fill in the remaining places automatically.

    That's why we use (n r)
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