If (18^a) * 9^(3a – 1)= (2^2)(3^b) and a and b are positive integers, what is the value of a?
Pick:	A) 22	B) 11	C) 9	D) 6	E) 2
(18^a) * 9^(3a – 1)= (2^2)(3^b)   = 2^a . 9^a . 9^(3a – 1) = (2^2)(3^b)   Just compare powers of 2 from both sides   Answer = 2 = 2
<result>E</result>
If (18^a) * 9^(3a – 1)= (2^2)(3^b) and a and b are positive integers, what is the value of a?