1. ## Evaluate this summation

Evaluate this summation

$\sum^{99}_{n=0}2^n(100C(n+1))$

100C(n+1) is meant to be combinatorics C(100,n+1)

2. Here is a hint: $\displaystyle 3^{100}=(2+1)^{100}=\sum\limits_{n = 0}^{100} {\binom{100}{n}2^n}$.