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If the operation '*' is defined by a * b = a + b - ab, then 5 * 7 equals :
Answer & Solution
Correct Answer:
Option
C
5 * 7
= 5 + 7 - 5 × 7
= 12 - 35
= - 23
= 5 + 7 - 5 × 7
= 12 - 35
= - 23
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