Tentukan ( a².b)³× (a.b⁴)¹

(a^2b)3 x (ab^4)1
(a^2x3b^3) x (a^1b^4x1)
(a^6b^3) x (ab^4)
(a^6 x a) (b^3 x b^4)
a^6b^12