What should come in place of the question mark '?' in the following number series?
78, 117, 234, 585, 1755, ?
1
6142.5
2
6042.5
3
60002.8
4
6024.5
5
6442.5
What should come in place of the question mark '?' in the following number series?
78, 117, 234, 585, 1755, ?