Question

Binomial theorem problem please help

Answer 1

\[ (a+b)^n=\sum_{j=0}^n\binom{n}{j}a^{n-j}b^j \]

Answer 2

hmn yes i know the formula but can u derive this formula ?

Answer 3

\[ (2-1)^n=\sum_{j=0}^n\binom{n}{j}2^{n-j}(-1)^j=1\]
right?

Answer 4

yes