What is 121^2

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• A 14641
• B 14461
• C 11641
• D 14161

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Answer: A. 14641

Use (a + b)^2 = a^2 + 2ab + b^2 with a = 120, b = 1: 14400 + 240 + 1 = 14641. It is also 11^4, a famous number.

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