1.

1 - 1 + 1 - 2 + 1 - 3 + ... up to n terms = ? n n n

A. 1 n 2
B. 1 (n - 1) 2
C. 1 n(n - 1) 2
D. None of these
Answer» C. 1 n(n - 1) 2


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