Answer:
There is another method which will give you answer too.
Sequence is 7,2,0,7,8,4,3,x..assuming that we are looking for x.
If you subtract 1st from 5th, 8-7= 1
2nd from 6th, 4-2= 2
3rd from 7th, 3-0= 3
and
4th from 8th, it should be '-4'.. x-7= 4.
So if you solve for x, you get 11.