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If $$n^2 = 123456787654321$$, what is $$n$$?
12344321
1235789
11111111
1111111
Observe the pattern given below. $$11^2 = 121$$ $$111^2 = 12321$$ $$1111^2 = 1234321$$ and so on.
So, $$11111111^2 = 123456787654321$$
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