Trying to work out this problem:
The answer is the summation from $k = 0$ to $n$ for $(-1)^k \binom {n} {k} (2n - k)! \ 2^k $
2026-03-28 12:49:15.1774702155
How many ways can n couples stand in a line so that no one stands besides their spouse?
407 Views Asked by Bumbble Comm https://math.techqa.club/user/bumbble-comm/detail AtRelated Questions in INCLUSION-EXCLUSION
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