Hi selected a from a card from an ordinary deck of 52 playing cards There is only 1 Ace of Spades: P(A of Spade) = 1/52 if the same variables are independent then they can be expressed as P(A∩B) = P(A) P(B). P(S∩A) = (13/52)(4/52) = ( 52)/ (52)(52) = 1/52 Wish You the Best in your Studies.