CBSE

MATHEMATICS · Single correct · CBSE · Mathematics · Binomial Theorem · Binomial Theorem

Problem

\sum_{r=1}^{n}\sum_{p=0}^{r-1} {}^nC_r\cdot{}^rC_p\cdot2^p

is equal to (1)

4^n-3^n+1

(2)

4^n-3^n-1

(3)

4^n-3^n+2

(4)

4^n-3^n