In every term of the expansion of $(x+y)^n$, the sum of the powers of $x$ and $y$ equals —

Question

Accepted Answer

$n$

Answer

$n-1$

Answer

$n+1$

Answer

$2n$

In every term of the expansion of (x+y)n(x+y)^n(x+y)n, the sum of the powers of xxx and yyy equals —