[RPET 1986]
A) $ \frac{n-1}{2} $
B) $ \frac{n+1}{2} $
C) $ \frac{n}{2} $
D) $ n $
Correct Answer: B
A.M. $ =\frac{1+2+3+……+n}{n}=\frac{\frac{1}{2}n(n+1)}{n}=\frac{n+1}{2} $ .
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