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[" 7.If the "11" letters "A,B,...,K" den...

[" 7.If the "11" letters "A,B,...,K" denote an arbitrary permutation "],[" of the integers "(1,2,...,11)," then "(A-1)(B-2)(C-3)...],[(K-11)" will be "],[[" (a) necessarily zero "," (b) always odd "],[" (c) always even "," (d) none of these "]]

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