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Find the modulo 7 remainder of the sum \(1+3+5+7+9+\dots+195+197+199\)

 Feb 4, 2021
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1 + 3 + 5 + ... + 199 = 199*200/2 = 19900 = 6 (mod 7).

 

The answer is 6.

 Feb 4, 2021

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