\( 1+2+3+\cdots+100 \)
Answer
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Answer
\( \frac{100(101)}{2} \)
Steps
Step 1 ：\( \frac{n(n+1)}{2} \)
Step 2 ：\( \frac{100(100+1)}{2} \)
Step 3 ：\( \frac{100(101)}{2} \)
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