Question 10

What is the average of first 39 even numbers ?

Solution

Sum of first $$n$$ even numbers = $$n(n+1)$$ and sum of first $$n$$ odd numbers = $$n^2$$

=> Average of first $$n$$ even numbers = $$\frac{n(n+1)}{n}=(n+1)$$

$$\therefore$$ Average of first 39 even numbers = $$(39+1)=40$$

=> Ans - (B)

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