The factorisation of : a (x + y + z) + b(x + y + z) + c(x + y + z) is

(a + b + c)(x + y + z) (ab + bc + ca)(x + y + z) (xy + yz + zx)(a + b + c) none of these.

(a + b + c)(x + y + z)

a(x + y + z) + b(x + y + z) + c(x + y + z) = (x + y + z) (a + b + c).