A card is picked at random from a pack or 52 playing cards.given that the picked card is a queen ,the probability of this card to be a card of spade is?
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P(A/B)=P(A intersection B)/P(B)
Where,A :- The card is spade
B:-The picked card is queen
=> P(A/B) =(1/52)*(52/4)
=> P(A/B) = 1/4 ans.
Hope it helps.