Question: Use a derivation like that in Problem 25 to obtain a formula for the arithmetic sum. In problem 25 S = 1 + 2 +

Use a derivation like that in Problem 25 to obtain a formula for the arithmetic sum.
Use a derivation like that in Problem 25 to obtain

In problem 25
S = 1 + 2 + 3 + ... + (n-2) + (n-1) + n
S = n+ (n-1) + (n-2) + ... + 3 + 2 + 1

I1 (a + kd) a+(a + d) + (a + 2d) + + (a + nd)

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