Question: Add both sides of the two equalities below, solve for S and thereby give another proof of Formula 1. S = 1 + 2 +

Add both sides of the two equalities below, solve for S and thereby give another proof of Formula 1.
S = 1 + 2 + 3 + ... + (n-2) + (n-1) + n
S = n+ (n-1) + (n-2) + ... + 3 + 2 + 1

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