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Q.
If a * b = 2a - 3b + ab, then 3 * 5 + 5 * 3 is equal to :
A.
22
B.
23
C.
24
D.
25
View Answer
Correct choice: A
Explanation:
3 * 5 + 5 * 3 = (2 * 3 - 3 * 5 + 3 * 5) + ( 2 * 5 - 3 * 3 + 5 * 3) = (6 + 10 - 9 + 15) = 22.
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