Find the average of first 40 natural numbers. Options: A . &nbsp18 B . &nbsp19.5 C . &nbsp20.5 D . &nbsp21

Find the average of fi

Question

Find the average of first 40 natural numbers.

Options:

A . 18

B . 19.5

C . 20.5

D . 21

Answer: Option C

Sol. Sum of first n natural numbers = ` (n(n+ 1))/(2)`

so , sum of first 40 natural numbers = `(40 xx 41)/(2) = 820`

`:.` Required average = `820/40` = 20.5.

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