$(11111111)^{2}$ equals:

123454321

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12321

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123456787654321

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1234567654321

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Solution

The correct option is C
123456787654321

The square of numbers containing only '1' follow a specific pattern.

Since it contains eight 1's, the number will first increase from 1 to 8 and then decrease to 1.

∴ $(11111111)^{2}$ = 123456787654321

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