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Sep 20, 2015 05:30 am
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On a partly cloudy day, Derek decides to walk back from work
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Problem Solving (PS)
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The sum of the digits used to write the sum 10 + 11 + 12 + 1
Aug 16, 2015
6
Re: Given: 4^(2t+1) - 4^(t+2) = 128, find t
Aug 14, 2015
3
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