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Back to the cards! In poker, a flush is when all five cards are the same suit. Find the probability of being dealt a flush (when being dealt five cards).


Start by just considering clubs. a) What is the probability that the first card dealt is a club?

BWhat is the probability that the second card dealt is a club given that the first one was a club?
CWhat is the probability that the third card dealt is a club given that the first two were clubs?
DWhat is the probability that the fourth card dealt is a club given that the first three were clubs?
EWhat is the probability that the fifth card dealt is a club given that the first four were clubs?

f) The probability of being dealt all five clubs is the product of the above probabilities. Why is this true and what is this probability?

g) You have now found the probability of being dealt a flush in clubs. This is the same as the probability of being dealt a flush in diamonds, hearts, or spades. Then, what is the proability of being dealt a flush?

Verified Answer :

a) 13 we know that the number of clubs in the deck/52 that the total number of cards in the deck =0 .25= 25%.

B12 the remaining number of clubs in the deck/51 the remaining number of cards in the deck = 0.235= 23.5%.
C11 same as above/50 the same as above = 0.22= 22%
D10/49 = 20.4%
E9/48 = 18.75%

f) The combinations that can be made with certain characteristics are
limited to say: ace of clubs to 12 other clubs, two of clubs to 12 other
clubs, three of clubs to 12 other clubs, etc. As the desired outcome is
reached, the probable outcome percentages must be multiplied together
to accommodate all combinations. the probability is .049%.

g) probability of dealt a flush is
1312111094/52515049*48 = 617,760/311,875,200 = 0.00198079232, or
0.2% when round up. This is any of the 13 cards needed in a particular
suit, times any of the remaining 12, times any of the remaining 11 after
that, and so on multiplied by 4 since there are four suits in which
this can occur. This is divided by the number of cards in the deck 52
times the remaining cards when that's drawn, and so on and so forth.