3b. (10 pts) Let (n), = n (n-1) (n-2). (n- k+ 1) (we call it also...

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3b. (10 pts) Let (n), = n (n-1) (n-2). (n- k+ 1) (we call it also falling factorial). Give a combi- natorial proof of the fol

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(n) = 1 Since in ce ? n(n-1)--(n=k+1) , Ocksmi clearly M )k enist for all *>, and ), =4 Ly k20 pete with out loss of general Identity ) (9), Iman- CD46202)-(:)? 2015 (15) +(5.)) (n_n); complete ) berangsuren. 4 3 45 ) (num), bokep 22 * 13 ) (nm); l

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