the binary operation *:R x R--->R is defined as a*b=2a+b.Find (2*3)*4

Given : a*b = 2a + b

⇒ 2*3 = 2 × 2 + 3 = 7

⇒ (2*3)*4 = 7*4 = 2 × 7 + 4 = 18

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