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Yes it is. Do you want to know something spectacular? Well, it's not too great. But if you switch 21 around to make 12, 12 is the square root of 144, which has the same numbers as 441! Isn't that cool. So if you know what 12 is the square root of, you know what 21 is the square root of. WARNING: THIS DOES NOT WORK WITH ALL NUMBERS!!!!!!!!!!!!

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16y ago

What else can I help you with?