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What is my problem in Mathematics ? While programming I did not have this mathematical formula...

What is my problem in Mathematics ?

While programming I did not have this mathematical formula in my mind : n*(n-1)/2 . The skill itself . So I was unable to find a solution because of lacking this formua in my mind.

What is my problem niow ? What should I reverse ? Algebra or what?

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Answer #1

QPage No. Date Lo 2 reteに 10 (10-1),2.

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