I am pretty sure there should be a combination formula for it, but I forgot. So I tried google but seems there is no formula

http://mathforum.org/library/drmath/view/57913.html

Is there really no formula?

Anyway so he started to make a table of combination. I told him I better start to see if I can code it, maybe it would help him to verify if the table of combination is correct. I came up w/ this. I hope its right otherwise his table of combination is wrong and my code is wrong.

val twoDollars = 200 val coinsCombo = for ( oneDollar <- 0 to (twoDollars/100); twentyCents <- 0 to (twoDollars/20); tenCents <- 0 to (twoDollars/10); if (oneDollar * 100 + twentyCents * 20 + tenCents * 10 == twoDollars) ) yield (oneDollar, twentyCents, tenCents) coinsCombo foreach println println(coinsCombo.size)