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By Ashik_01, history, 5 years ago, In English

How to use the modulo operation on (n/2)*(2a+(n-1)d).I have to give the summation of the series modulo 10^9+7.Please help me.

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5 years ago, # |
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(n/2)*(2a+(n-1)d) % 1000000007

problem solved

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5 years ago, # |
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https://cp-algorithms.com/algebra/module-inverse.html

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