SSC CGL 9 Aug 2015 Shift 1 Paper

Question : 121 of 200

Marks: +1, -0

What is the Arithmetic mean of the first ‘n’ natural numbers ?

Solution:

Sum of first n natural numbers
=

{n(n+1)}/2

∴ Required average
=

{n(n+1)}/{2×n}

{n+1}/2

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