Question: n-1 O a. (n? 1) O b. 5 (n + 1) O c. n(n+1) 2 O d. n(n + 1)(2n + 1) O e.

n-1 O a. (n? 1) O b. 5 (n + 1) O 


n-1 O a. (n? 1) O b. 5 (n + 1) O c. n(n+1) 2 O d. n(n + 1)(2n + 1) O e. 00 O f. n3 O g. (n + 2) (n2 1) O h. n(n 1)(2n 1) O i. "(n+1)(2n+1) 6

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