If a#b = ab – b + b^2, then 3#7 =	Choose the correct choice from the following choices:
A) 2	B) 63	C) 15	D) 21	E) 35

Rationale: solution - simply substitute 3 and 7 in equation in the place of a and b respectively . 3 # 7 = 3 * 7 - 7 + 7 ^ 2 = 21 - 7 + 49 = 63 . ans b
Answer: B