Identify the missing characters:
1, 4, ?, 16, 25

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• A 9
• B 12
• C 7
• D 13

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Answer: A. 9

The terms are square numbers: 1 = 1 x 1, 4 = 2 x 2, 16 = 4 x 4, 25 = 5 x 5. The missing term is 3 x 3 = 9.

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