If e is a positive integer, then 3^e + 3^(e +1) = Choose the correct choice from the following
A) 4^a  B) 3^a − 1  C) 3^(2a) + 1  D) 3^a*(a − 1)  E) 4(3^e)
3^e + 3^(e +1)   = 3^e + (3^e * 3^1)   = 3^e (1 + 3)   = 3^e(4)   Ans. 4(3^e)) 4(3^e)
<result>E</result>
If e is a positive integer, then 3^e + 3^(e +1) =