If 1, _9 (3^ 1-x + 2 ), _3 (4.3^x - 1 ) are in A.P. then x equals

JEE Main 2002 Mathematics question

If are in A.P. then equals

Answer: (3)

For an A.P., . Since : , so . Put : $ + 5 = 12y ⇒ -

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Question ID VK-037999