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Let * be a binary operation on the set I of all integers, defined by a * b = 3a + 4b – 2. Find the value of 4 * 5.

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It is given that

a * b = 3a + 4b – 2

So we get

4 * 5 = 3 × 4 + 4 × 5 – 2 = 30

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