# Thread: need help on card probabilities

1. ## need help on card probabilities

adam picks a card at random from a normal pack of 52 playing cards. find each of the following probabillities.
a. p(a jack) b. p(a heart) c. (a picture card) d. p(ace of spades) e. p(a 9 or a 10) bet u cant do it cause i cant please help!!!!

2. Originally Posted by hazardh
adam picks a card at random from a normal pack of 52 playing cards. find each of the following probabillities.
a. p(a jack) b. p(a heart) c. (a picture card) d. p(ace of spades) e. p(a 9 or a 10) bet u cant do it cause i cant please help!!!!
a. $P( \mbox{Jack}) = \frac {\mbox{number of Jacks in the deck}}{\mbox{number of cards in the deck}}$

b. $P( \mbox{Heart}) = \frac {\mbox{number of Hearts in the deck}}{\mbox{number of cards in the deck}}$

c. $P( \mbox{A picture card}) = \frac {\mbox{number of picture cards in the deck}}{\mbox{number of cards in the deck}}$

d. $P( \mbox{9 or 10}) = P(9) + P(10) - P(9\mbox{ and }10) = P(9) + P(10) =$ $\frac {\mbox{number of 9's in the deck}}{\mbox{number of cards in the deck}} + \frac {\mbox{number of 10's in the deck}}{\mbox{number of cards in the deck}}$