Sorry if this is the wrong place to post this but was not sure.

I trying to solve this maths question to win this contest 15 Promo Codes to be won for Combi10 - Touch Arcade and was wondering if anyone had an idea to the answer.

Basically the question is how many combinations of 10 can you make for eight numbers all with a value of 2, i.e. how many combinations are there of 2,2,2,2,2 (adds up to 10)

Any ideas? Thanks for the help in advance.