RRB Junior Engineer Stage 1 Model Papers 9

Question : 4 of 100

Marks: +1, -0

What is the arithmetic mean of first 20 odd natural numbers?

Solution:

For 20 natural last odd number

= 1 + (20 – 1) × 2 = 39

Arithmetic mean of odd number

={n+1}/2=40/2=20

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