RRB NTPC Prelims Model Paper 2 with solutions

Question : 7 of 101

Marks: +1, -0

The average of first thirty natural numbers is

Solution:

(3) Sum of first 30 natural
numbers

={n(n +1)}/2={30(30 +1)}/2

= 465
Therefore, average

=465/30= 15.5

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