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• Mod 17
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  The answer choices of this problem are 1 to 16, but it overlooked the possibility that n is divisible by 17, which will always give a remainder of 0. There should be an answer choice 0

• Find All Solutions
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  The solution to the set of the equations given in the explanation is y=51 and x=50. Then, the correct square is 2500 and the answer is 7. There was an error in the explanation and it got x=51.

• Revisiting GCDs
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  @thoughtfulmongoose Let a=2x and b=2y, then the question is asking for the GCD of 2x and 4y. Obviously 2 is a common divisor, but we don't know if x has any more 2s in it. If x has one more factor of 2 and y has none then the greatest common divisor is 4. So the answer should be NEI(not enough info)