A) \[\frac{n(n+2)}{n}\]
B) \[\frac{n\left( n-1 \right)}{2}\]
C) \[\frac{n+1}{2}\]
D) \[\frac{n-1}{2}\]
Correct Answer: B
Solution :
\[\frac{n\left( n-1 \right)}{2}\]
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