What is the value of 111 111 1 x 111 111 1 ?

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• A 1234567654321
• B 12345677654321
• C 1234566754321
• D 123465754321

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Answer: A. 1234567654321

Squares of numbers made of 1s rise and fall: 1111111 has seven 1s, so its square counts 1 to 7 and back: 1234567654321.

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