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The binary operation * on R be defined by a * b = 2a + b. Find (2 * 3) * 4.

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It is given that

a * b = 2a + b

So we get

(2 * 3) * 4 

= (2 × 2 + 3) * 4

= 7 * 4 = 2 × 7 + 4 

= 18

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