RRB Group D Model Paper 5 with solutions

Question : 30 of 100

Marks: +1, -0

The average of 1, 3, 5, 7, 9, 11,……., 25 terms is

Solution:

(4) Sum of the first n odd numbers=

n^2

The sum is

(25)^2

= 625
Average =

625/25

= 25

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