<p>If a and b are positive integers and (a^1/2 x b^1/3)^6 = 432, what is the value of ab?</p>

<p>A. 6

B. 12

C. 18

D. 24

E. 36</p>

<p>This is baffling me. Every math book says you can't multiply exponents if the bases are different. So what am I supposed to do? Randomly pick numbers that are factors of the answer choices, square root and cube root them and see if any equal the 6th root of 432?? Something tells me there has to be a better way. Please, please help. Thank you!!!!!</p>