Use the formula $$S = \frac{n(n+1)}{2}$$ to find the sum of $$1+2+3+...+490$$. $$1+2+3+...+490 =$$ (Simplify your answer.) View an example Get more help Clear all More
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..+490$$ using the given formula $$S = \frac{n(n+1)}{2}$$. Show more…
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