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Option 3 : 9
⇒ 4(x – 1) 9(2y – 8) = 5184
⇒ 4(x – 1) 81(y – 4) = 43 × 811
Comparing both sides, we get
x – 1 = 3 and y – 4 = 1
⇒ x = 4 and y = 5
∴ x + y = 4 + 5 = 9
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