# A game is played by choosing 2 cards randomly from a deck of cards.

1. 50
cartee33posted 14 years ago

A game is played by choosing 2 cards randomly from a deck of cards.

Everytime you choose 2 cards that are face cards or 2 cards that are consecutive (i.e. 4 and 5, Jack and Queen), you win the game. If you recieve \$2.00 everytime you win the game, determine the expected amount of winnings after 100 games.

2. 66
t.eliaposted 14 years ago

I am going to work this out assuming that Im working with the following; King, Queen, Jack, 10, 9, 8, 7, 6, 5, 4, 3, 2, and Ace

Thats 13 cards per suit;  Diamonds, Spades, Clubs and Hearts
a total of 52 cards

First lets calculate the probability of drawing two consecutive cards from one suite;

you win only if the two cards are consecutive;

= 13(c2)   = 13 x 12 / 2 = 78

so ...no of ways this can happen is ( n -1 ) = 13- 1 = 12

probability for win = 12 /78 per suit

For 100  games number of wins;

=  100 x 12 / 78 = \$15.38 x 2\$ per win = \$30.76

to get the probability of the deck divide by 4

\$30.76 / 4 = \$7.69

Hope this helps

working