if n is a natural number , then ( 7 ( n 2 ) + 7 n ) is always divisible by :
"solution ( 7 n 2 + 7 n ) = 7 n ( n + 1 ) , which is always divisible by 7 and 14 both , since n ( n + 1 ) is always even . answer d"
add(multiply(7, const_100), multiply(2, 7))