What should come in place of the question mark (?) in the following number series?
25, 16, ?, 4, 1

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None of these

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Solution

The correct option is E None of these
25 16 ? 4 1
i.e., $5^{2} 4^{2} 3^{2} 2^{2} 1^{2}$
Hence, ? = 9

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