2.) from a deck of 52 cards, what is probability of selecting an ace of spades then an ace of hearts without replacement ?

There are 52 cards in the complete deck, and only one of them is the ace of spades.

-- On the first draw, the probability of drawing the ace of spades is 1/52 .

Then there are only 51 cards left in the deck.

-- On the second draw, the probability of drawing the ace of hearts is 1/51.

-- The probability of both events is

           (1/52) x (1/51) = 1/2652  =  about 0.038% .