Let * be a binary operation on the set Q of rational numbers defined by ab = a-b for all all $a, b ϵ Q$ , then the value of (-4 5) * 7 is

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-16

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-2

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Solution

The correct option is B
-16

(– 4 * 5) * 7 = (–4 * 5) * 7

= - 9 * 7 = – 9 * 7 = - 16

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