A = event of drawing a blue card on the first selection B = event of drawing a blue card on the second selection
P(A) = probability of drawing a blue card on the first selection P(A) = (number of blue cards)/(number of cards total) P(A) = 5/8
P(B|A) = probability of getting a second blue card GIVEN the first card is blue P(B|A) = (number of blue cards left after event A happens)/(number of cards left) P(B|A) = 4/7
The fact that B depends on A is very important. This happens because the first card is not replaced
