11:120::13:? What value will replace the question mark?

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• A 168
• B 169
• C 170
• D 171

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Answer: A. 168

11 x 11 = 121 and 121 - 1 = 120, so the rule is square the number and subtract 1. For 13: 13 x 13 = 169, and 169 - 1 = 168.

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