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Question 15

If $$n^2 = 123456787654321$$, what is $$n$$?

Solution

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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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