what is the sum of following permutation series $nP0 + nP1 + nP2+\cdots+ nPn$ ?
I know that $nC0 + nC1 +\cdots + nCn = 2^n$, but not for permutation. Is there some standard result for this ?
what is the sum of following permutation series $nP0 + nP1 + nP2+\cdots+ nPn$ ?
I know that $nC0 + nC1 +\cdots + nCn = 2^n$, but not for permutation. Is there some standard result for this ?