$(a + b + c)^p - (a^p + b^p + c^p)$ is always divisible by
(a) $p - 1\quad$ (b) $a + b + c\quad$ ( c ) $p\quad$ ( d ) $p^2 - 1$
$p$ is prime
I am able to solve this by substituting values and by euler theorem by assuming $( a + b + c )$ are co prime with $p$.
But I am unable to solve it by expansion nothing is working