RRB NTPC Mains or Stage 2 Model Paper 1 with solutions

Question : 71 of 120

Marks: +1, -0

The mean of first 50 natural numbers is

Solution:

(2)

1 + 2 + 3 + ..... + n ={n(n +1)}/2

∴Required average

={n +1}/2 ={50 +1}/2=51/2 = 25.5

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