Counting calculation program (sort of )

[MYST]

Hiya,

I'm basically wanting to write a prog, that calculates the number of combinations of a number of numbers. Ie - between 1 and 9, how many 4 digit number combinations are there and so on.
I cant however seem to think of a logical way of doing this...

Could anyone offer some guidance on how to accomplish this... not write it for me, but point me in the right direction

Thanks

[kevinchkin]

Looks like a simple problem of permutation ( if repetition is allowed) else combination.

[MYST]

Yeah i get that, i just cant work out how to write it...

[Bazzy]

Do you know how to do that without C++? -using just a calculator?-
If you can, write the steps you follow to get the result and then convert that into C++

[MYST]

I don't i'm afraid mate. Do you?

[Bazzy]

See wikipedia:
http://en.wikipedia.org/wiki/Combination