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Mathematics 24 Online
OpenStudy (anonymous):

Prove that an integer is divisible by 4 iff its last digit plus twice its second from last digit is divisible by 4.

OpenStudy (anonymous):

I posted this question yesterday, and it has been answered. :( http://openstudy.com/groups/mathematics/updates/4e6a08620b8b4a2b95d34b52

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