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Question

* is a binary operation on Z such that : a * b =  - a + b + ab.Then the value of 2 *(-3)*5  is


  1. -11

  2. 11

  3. -39

  4. 39


Solution

The correct option is C

-39


2*(-3) = -2-3+2(-3) = -5-6 =-11

2*(-3)* 5 =(-11)* 5 = -(-11) +5 + (-11) x 5  = 11+5 - 55 = -39

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