There are 13 yellow cards, 6 blue cards, 10 red cards, and 8 green cards in a stack of cards turned face down. Once a card is selected, it is not replaced. Find each probability.

P(2 blue cards)
P(2 red cards)
P(a yellow card and then a green card)
P(a blue card and then a red card)
P(two cards that are not red)
P(two cards that are neither red nor green)