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OpenStudy (dls):
Find the number of permutations of first N natural numbers such that given conditions should be satisfied. The given conditions can be something like this x and y not occurs consecutively p and q not occurs consecutively r and s not occurs consecutively ..etc
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ganeshie8 (ganeshie8):
Is it not simply \[N! - 2*(N-1)!\] ?
OpenStudy (dan815):
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