Find the average of first 50 natural numbers.
Answers
A) 20.5  B) 18  C) 25.5  D) 19  E) 17
Exp. Sum of first n natural numbers = n( n+1)/2   So, sum of first 50 natural numbers = 50*51/2= 
<gadget id="calculator">50*51/2</gadget>
<output>1_275</output>
1275   Required average=1275/50= 
<gadget id="calculator">1275/50</gadget>
<output>51/2 = around 25.5</output>
25.5   Answer:25.5
<result>C</result>
Find the average of first 50 natural numbers.