I decided to do some Project Euler problems using F#. 

So here is my first one, Problem # 31.  Nothing in this solution really shows off anything special about F# but you have to start somewhere ;)

let rec combos amt (denoms:int list) = 
   if amt = 0 then 1
   elif denoms.IsEmpty || amt < 0 then 0
   else 
       combos (amt – denoms.Head) denoms + 
       combos amt denoms.Tail
   
   
printf "\n\nThe Anwer is: %i \n" (combos 200 [200;100;50;20;10;5;2;1])