Without repeating if I take 0 thing out of n, how the permutation will be 1 (nP0 = 1)? And what will be that permutation? Even allowing repetition, the result is 1 (n^0 = 1)?
How is the permutation 1 and what is that permutation?
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Just as there is exactly one subset of any set that has no elements—namely, the empty set—there is exactly one ordered selection of any set that has no elements—namely, the empty selection.
Brian Tung
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We say that selecting 0 elements out of n, but the result is empty selection?! Why? – Shuvo Sarker Feb 19 '16 at 06:43
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1The empty selection is the selection with nothing in it. There is exactly one selection which is empty. – Ian Miller Feb 19 '16 at 06:48