Quote by jinbaw
Umm.. Can you elaborate a bit what you mean ?
Thanks

There is no difference between the suits. So whatever probability you have for the last suit being spades will also be the probability for clubs, diamonds and hearts. That is, the suits are symmetrical in this problem.
Also, consider this. The last suit left is bound to be the suit of the last card in the deck. So you really only need to know the last card to know what suit will be left last.