RRB NTPC Prelims Model Paper 2 with solutions

Question : 8 of 101

Marks: +1, -0

The average of first thirty natural numbers is

Solution:

Sum of n=30 natural numbers

=\;{n(n+1)}/{2}

=\;{30(30+1)}/{2}=\;{30(31)}/{2}=465

for Average divide sum by 30 =

465/30 = 15.5

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