If 3^8 x 3^7 = 3^n what is the value of n?	Pick one
A) 20 B) 18 C) 17 D) 16 E) 15

Rationale: "3 ^ 8 * 3 ^ 7 = 3 ^ n or 3 ^ 8 + 7 = 3 ^ n n = 15 e"
Answer: E