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Which of the following is noth the number of ways of selecting n objects from 2n objects of which n objects are identical |
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Answer» `2^(n)` `:.` Total no. of solutions `=sum_(r=0)^(n).^(n)C_(r )=2^(n)` No. of possible subsets of a set containing `n` elements is `2^(n)` and `.^(2n+1)C_(0)+^(2n+1)C_(1)+^(2n+1)C_(2)+...+^(2n+1)C_(n)=2^(2n)` |
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