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[quote="praetorian123"]If n^2 = 123456787654321, what is n?
please show your work.
Hello, I think (3) is the answer.
There is a pattern when squaring "all 1-digited" numbers such as 1,11,111, and so on. It depends on the number of digits you are squaring.
For example, 11^2= 121
As you can see, the digit-numbers increase consecutively from 1 to the number of "all 1-digited" you are using and then they decrease following the same pattern, so if you square an eight-digited "all 1" number, such as 11111111, you will get 123456787654321.
I hope I have been clear enough in spite of my poor writing skills.