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Given a + 3 = b (i)3 a 5+ 9 3 312 b 8For 12b8 to be divisible by 11(8 + 2) -(b + 1) = 0 ⇒ 10-b-1=0⇒ 9-b=0⇒ b=9∴ From (i) a = 6∴ a + b = 6 + 9 = 15

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