How many combination of picking 10 numbers out of 49?

Answer 1

I posted a link to a site that explains this stuff really well.

If this is like Lotto numbers - you have 49 unique balls (no repetition), and you're picking 10 of them, and order does not matter - then here is the formula:

C(n,r) = n! / (r! * (n-r)!), where n is the number of things that you are choosing from, and r is the number of items that you are choosing. In this case n=49 and r=10.

49! / (10! * (49-10)!) = 8,217,822,536 {8.2178 Billion}

If this is not the type of problem you are trying to solve (like order matters, etc), then check out the Mathisfun link that I posted.