A) 100
B) 51
C) 505
D) 49.5
Correct Answer: C
Solution :
[c] \[1+2+3+.....+n=\frac{n\,\,(n+1)}{2}\] \[\therefore \]Average \[=\frac{n+1}{2}=\frac{100+1}{2}=50.5\]You need to login to perform this action.
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