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For a real number x, if 1/2, log₃(2ˣ-9)/log₃4, and log₅(2ˣ+17/2)/log₅4 are in an arithmetic progression, then the common difference is:

CAT · 2023 · Quant Slot 3
Question:
For a real number x, if 1/2, log₃(2ˣ-9)/log₃4, and log₅(2ˣ+17/2)/log₅4 are in an arithmetic progression, then the common difference is:

Options

(1) log₄7
(2) log₄(3/2)
(3) log₄(7/2)
(4) log₄(23/2)
Answer: (3) log₄(7/2)

Explanation:
Using the property of AP where 2b = a + c, and converting logarithms to base 4, we can solve for the common difference to get log₄(7/2).

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