Hi,

Can someone help me with a formula that will give me the number of non consecutive numbers in a given number of events.

So, if I had thirty selections how can I work out how many combinations of three numbers there are in the thirty selections. ie. 1,3,5 1,3,6 1,3,7 etc

I would like a formula that allows me to put in the total number of events coupled with the number of selections. So, I would like to be able to work out, say, the number of four non consecutive groups in a total of, say, ten selections.

As you've probably realised this is linked to some gambling probabilities. Hope you can help.

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