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## Sum of reciprocals of the triangle numbers

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## Determine whether following series converge or diverge. If converges find its sum?

October 16th, 2020

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## Show that $\phi(p^e)=p^e-p^{e-1}$

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August 1st, 2022

## Reasoning and Explanation for $2/3-1/2$

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August 6th, 2022

## Show that $\sum_{i=1}^n (x_i - \bar{x})(y_i - \bar{y}) = \sum_{i=1}^n (x_i - \bar{x})(y_i)$.

October 7th, 2020

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## Prove a non-decreasing sequence diverges to infinity

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