if ' a ' and ' b ' are non - zero numbers such that their sum is 6 times the product , what is the value of 1 / a + 1 / b ? Choices.
A) 5	B) 6	C) 7	D) 8	E) 12

Rationale: a + b = 6 ab 1 / a + 1 / b = ( b + a ) / ( ab ) = 6 . the answer is b .
Answer: B