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S=1+2+3+⋯+(n−1)+n+(n−1)+…+3+2+1S=1+2+3+\cdots+(n-1)+n+(n-1)+\ldots+3+2+1S=1+2+3+⋯+(n−1)+n+(n−1)+…+3+2+1
Find general formula of SSS.
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