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Question
Let * be a binary operation defined by a * b = 3a + 4b − 2. Find 4 * 5.
Solution
Given: a * b = 3a + 4b − 2
Here,
4 * 5 = 3 (4) + 4 (5)\[-\] 2
= 12 + 20 \[-\] 2
= 30
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