Question

Which of the following best describes the terms of the series? $\frac{1}{2}$${}^n{C}_1$ - $\frac{2}{3}$${}^n{C}_2$ + $\frac{3}{4}$${}^n{C}_3$...................$(-1{)}^{n+1}$ $\frac{1}{n+1}$${}^n{C}_n$

• A.
• B.
• C.
• D. ×

Answer 1

The correct option is A

By going through each option and cross checking, we find that only (A) satisfies the condition.