If a - b = 3 and a2 + b2 = 29, find the value of ab.	Choose the correct choice from the following options:  A) 10  B) 12  C) 13  D) 15  E) 18

Rationale: "2 ab = ( a 2 + b 2 ) - ( a - b ) 2 = 29 - 9 = 20 ab = 10 . answer : a"
Answer: A