If a * b = 2a – 3b + ab, then 3 * 5 + 5 * 3 is equal to

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a * b = 2a – 3b + ab
⇒ 3 * 5 = 2 × 3 – 3 × 5 + 3 × 5 = 6
5 * 3 = 2 × 5 – 3 × 3 + 3 × 5
= 10 – 9 + 15 = 16
Therefore, 3 * 5 + 5 *3
= 6 + 16 = 22