If a * b = 2a – 3b + ab, then 5 * 7 + 7 * 5 is equal to:
Choose the correct choice from the following options:
A) 34 B) 18 C) 72 D) 78 E) 82

Rationale: 5 * 7 + 7 * 5 = ( 2 * 5 – 5 * 7 + 5 * 7 ) + ( 2 * 7 – 5 * 5 + 7 * 5 ) = ( 10 + 14 – 25 + 35 ) = 34 . answer : a
Answer: A