P(A|B) is the conditional probability of Event A which gives us the probability of Event A occuring given that Event B has already occured .
After the first card is drawn , things that have changed from a regular deck of card are :
Since there is no replacement , so the no. of cards total left = 51
No. of number 9 cards left = 4-1 =3 ( since there are total 4 cards of each number )
No. of cards of heart suit left = 13 -1 =12 ( since each suit has 13 cards each)
rest of cards are same as a regular deck of cards
In general , Probability of a Event = No. of favourable outcomes / Total No. of outcomes
a. P( 9| 9 of hearts) = No. of number 9 cards left / Total cards left = 3/51 = 1/17
b. P(heart | 9 of hearts ) = No. of hearts cards left / Total cards left = 12 / 51 = 4 / 17
c. P(clubs| 9 of hearts) = No. of clubs left / Total cards left = 13 / 51
d. P( 7 | 9 of hearts) = No. of number 7 left / Total cards left = 4 / 51
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