There are 52 playing cards.
∴ n(S) = 52 i. Let A be the event that the card drawn is an ace.
∴ n(A) = 4
∴ P(A) = \(\frac{n(A)}{n(S)}\)= 4/52
∴ P(A) = 1/13
ii. Let B be the event that the card drawn is a spade.
∴ n(B) = 13
∴ P(B) = \(\frac{n(B)}{n(S)}\) = 13/52
∴ P(B) = 1/4
∴ P(A) = 1/13 ; P(B) = 1/4