Question

sum of the even numbers below 71 is .....

Answer 1

You can make it to arithmetic progression

2,4,6 .......70

which gives n=(70/2)= 35

So
$s = \frac{n}{ 2} \times(first \: term + last \: term)$
where
First term= 2
Last term= 70

so Ans= 1260

Answer 2

i think answer is 1260 i dont know is it correct