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Standard Limits to Remove Indeterminate Form

* is a binary...

Question

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

A

-11

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B

11

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C

-39

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D

39

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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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