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| 1. |
If `S_(n) = sum_(r=0)^(n) (1)/(""^(n)C_(r))` and `t_(n) =sum_(r=0)^(n) (r )/(""^(n)C_(r))`, then `(t_(n))/(s_(n))` is equal to -A. `n/2`B. `n/2 - 1`C. `n- 1`D. `(2n-1)/(2)` |
| Answer» Correct Answer - A | |