What should come in place of the question mark '?' in the following number series?
1220, 1617, 2086, 2633, 3264, (?)
1
3990
2
3985
3
3980
4
3975
5
3970
What should come in place of the question mark '?' in the following number series?
1220, 1617, 2086, 2633, 3264, (?)