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No. of selections of r things (r<=n) out of n identical things is 1
No. of different selections of r things (r<=n) out of n identical things is 1
In mathematics, a combination is a way of selecting items from a collection, such that (unlike permutations) the order of selection does not matter. In smaller cases it is possible to count the number of combinations. For example, given three fruits, say an apple, an orange and a pear, there are three combinations of two that can be drawn from this set: an apple and a pear; an apple and an orange; or a pear and an orange.
Did you mean combinations rather than permutations?
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