Saved Bookmarks
| 1. |
The number of all subsets of a set containing `2n+1` elements which contains more than `n` elements isA. `2^(n)`B. `2^(2n)`C. `2^(n+1)`D. `2^(2n-1)` |
|
Answer» Correct Answer - B `.^(2n+1)C_(n+1)+ .^(2n+1)C_(n+2)+…+ .^(2n+1)C_(2n+1)` `=1/2((.^2n+1)C_(0)+ .^(2n+1)C_(1)+ .^(2n+1)C_(3)+…+ .^(2n+1)C_(2n+1))=2 .^(2n)` |
|