Is there a way to solve this question faster than the approach mentioned in the ETS book?

The sequence of numbers a1,a2,a3,…,an,… is defined by an =

I tend to struggle in Sequence questions.

Is there a way to solve this question faster than the approach mentioned in the ETS book?

The sequence of numbers a1,a2,a3,…,an,… is defined by an =

I tend to struggle in Sequence questions.

just write down the terms and you’ll see the pattern.

a1 = 1/1 - 1/3

a2 = 1/2 - 1/4

a3 = 1/3 - 1/5

a4 = 1/4 - 1/6

So now, as you can see, the second tern of the first element and the first term of the third element cancels out… sane thing happens till 20… so just find out the remaining terms.