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Problem
\( 1+2+3+\cdots+100 \)
Solution
Step 1 :\( \frac{n(n+1)}{2} \)
Step 2 :\( \frac{100(100+1)}{2} \)
Step 3 :\( \frac{100(101)}{2} \)
From Solvely APP
Source:
https://solvelyapp.com/problems/15553/
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