Question: Derive the formula 1 + 2 + 3 + ... + n = n(n + 1)/2 Let Sn = 1 + 2 + 3 +

Derive the formula
1 + 2 + 3 + ... + n = n(n + 1)/2
Let Sn = 1 + 2 + 3 + ... + n. Write the terms of Sn in reverse order and add the two expressions for Sn.

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