Question

Evaluate binomial sum involving $\sum C_r \frac{2^r}{r+1}$ for $n=10$.}

• A. $\frac{3^{11}-1}{11}$
• B. $\frac{3^{11}-1}{22}$
• C. $\frac{3^{10}-1}{22}$
• D. $\frac{3^{10}-1}{11}$

Hint:

Use integration trick for binomial denominators.

Answer 1

The Correct Option is B