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Question Number 47712 by Rio Michael last updated on 13/Nov/18
show that ^(^2 C_2 ) C_n = (1/((1−n)!(n−1)(n−2)(n−3)...3(2)(1)))
showthat2C2Cn=1(1−n)!(n−1)(n−2)(n−3)…3(2)(1)

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