What is the average of first 39 even numbers ?
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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