If a * b = 2 (a + b), then 5 * 2 is equal to :

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If a * b = 2 (a + b), then 5 * 2 is equal to :

1. 3
2. 10
3. 14
4. 20

Correct Option: C

a * b = 2 (a + b)
∴ 5 * 2 = 2 (5 + 2)
= 2 × 7 = 14