If a#b = ab – b + b^2, then 3#7 =  Choose the correct answer
A) 2 B) 63 C) 15 D) 21 E) 35
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= 
<gadget id="calculator">21 - 7 + 49</gadget>
<output>63</output>
63. ANS 63
<result>B</result>
If a#b = ab – b + b^2, then 3#7 =