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OpenStudy (anonymous):
Will give medal What is the sum of the first n terms of this sequence? 3, 4, 5, 6, 7, ... a. n(n+1)/2 b. 3 n(n+1)/2 c. n(n+1)/2 +n d. n(n+1) e. 5 n(n+1)/2 -n
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