1,4,9,16,?

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• A 20
• B 25
• C 30
• D 36

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Answer: B. 25

The numbers are squares: 1 x 1 = 1, 2 x 2 = 4, 3 x 3 = 9, 4 x 4 = 16. Next comes 5 x 5 = 25.

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