BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

probability from deck of cards

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 66
Joined: Mon Jun 14, 2010 4:46 am
Thanked: 3 times

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)
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 362
Joined: Fri Oct 02, 2009 4:18 am
Thanked: 26 times
Followed by:1 members

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"
Top
Senior | Next Rank: 100 Posts
Posts: 66
Joined: Mon Jun 14, 2010 4:46 am
Thanked: 3 times

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)
Top
Post new topic Post Reply
• Page 1 of 1