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If a, b and c are positive integers and if a=2b and a^2+b^2=c, which of the following cannot equal to c? a) 5 b)20 c) 50 d) 125 e) 500

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|dw:1373735734443:dw| c is 5 times a square number. Divide each of the possible answers by 5 and see which one isn't a square number.
man really lol
Jack seriously I am not a smart person xD stahp

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Other answers:

@.Sam. please save time and help
You have a relation between two of the three variables, so use it. You will be eliminating one of them in the process. Finally you get a simple expression, as solved above by a member. Try out all the given options and get to the correct answer.
DDCamp gave a really nice method, why am i being tagged?
Please stop tagging me. That was 12 notifications when I logged on JUST from you.
im so sorry

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