Question:The average of first `50` natural numbers is : 

A `12.25` 
B `21.25` 
C `25` 
D `25.5` 

+ Answer
D 

+ Explanation
Sum of first n natural numbers 

`= (n(n + 1))/(2n)`

`= (n + 1)/2`

:. Average 

`= ((50 + 1)/2)`

`= 51/2`

`= 25 .5`

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Irin Moni

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