1. n different toys are to be distributed among n children. find the number of ways in which these toys can be distributed so that exacly one child gets no toy.

soln.  no. of ways of forming group of toys of quantity 1 and 2: n!/[(1!)^(n-2)]*(2!)*(n-2)!

sir now my doubt is in how many ways we can arrange

 these grps, so as to get the complete soln.

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