Question: Write out the first three terms and the last term. Then use the formula for the sum of the first n terms of an arithmetic

Write out the first three terms and the last term. Then use the formula for the sum of the first n terms of an arithmetic sequence to find the indicated sum. 30 [ (-21+1) i = 1 . . . Find the first three terms and the last term. 30 _ (- 21+ 1) = (1) + + + ... + i = 1

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