Hi All,

Firstly apologies for title, hard to phrase my requirements without using an example,
Basically i'm looking for a formula to calculate A1-A2, answer - A3, answer - A4 and so on
A1 = 10
A2 = 1
A3 = 2
A4 = 1
therefore formula should 10-1=9-2=7-1=6

Hope the above makes sense