Find the average of first 30 natural numbers. Choose the correct choice:	A) A)13.5	B) B)20.5	C) C)18.6	D) D)15.5	E) E)12.3
Sum of first n natural numbers = n(n+1)/2   sum of first 30 natural numbers = 30*31/2= 
<gadget id="calculator">30*31/2</gadget>
<output>465</output>
465   average= 465/30= 
<gadget id="calculator">465/30</gadget>
<output>31/2 = around 15.5</output>
15.5   Answer is 15.5
<result>D</result>
Find the average of first 30 natural numbers.