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probability from deck of cards

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by jamesk486 » Mon Jul 26, 2010 3:03 pm
If a card is drawn from a deck, what is the chance that it will be a diamond, a spade or a
king?
A. 7/13
B. 1/2
C. 15/26
D. 8/13
E. None of the above
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by JeetGulia » Mon Jul 26, 2010 3:31 pm
jamesk486 wrote:If a card is drawn from a deck, what is the chance that it will be a diamond, a spade or a
king?
A. 7/13
B. 1/2
C. 15/26
D. 8/13
E. None of the above
Answer is B 1/2?

(13/52+13/52+4/52)-(1/52+1/52)

(Prob of diamond+prob of Spade +Prob of King) -(Prob of Diamond king + prob of spade king)
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by indiantiger » Mon Jul 26, 2010 3:38 pm
Answer A

probability of diamond is = 13C1/52C1
probability of spade is = 13C1/52C1
probability of king = 4C1/52C1
probability of diamond king is = 1/52C1
probability of spade king is = 1/52C1

total probability = 13/52 + 13/52 + 4/52 -1/52 -1/52 = 7/13
"Single Malt is better than Blended"
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by JeetGulia » Mon Jul 26, 2010 3:47 pm
JeetGulia wrote:
jamesk486 wrote:If a card is drawn from a deck, what is the chance that it will be a diamond, a spade or a
king?
A. 7/13
B. 1/2
C. 15/26
D. 8/13
E. None of the above
Answer is B 7/13...correction

(13/52+13/52+4/52)-(1/52+1/52)

(Prob of diamond+prob of Spade +Prob of King) -(Prob of Diamond king + prob of spade king)
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