Probability

I believe the answer here is A, assuming that a standard deck is 4 suits of 13 cards each. In that standard deck, 2 of the 4 suits are red (hearts and diamonds), so that would be 2 x 13, plus the 2 5's from the black suits. A total of (2 x 13) + 2 = 28/52, or 7/13.

Andrea A.
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pkw209: Master | Next Rank: 500 Posts; Posts: 266; Joined: Mon Oct 19, 2009 9:46 pm; Thanked: 8 times; GMAT Score:690

by pkw209 » Wed Apr 21, 2010 4:41 pm

Yup, that's right! Also, it's a different method from how I solved it.

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

by indiantiger » Wed Apr 21, 2010 5:18 pm

P(RED CARD) = 26/52
P(5 CARD) = 4/52
P(5 and RED CARD) = 2/52

overall probability

P(RED CARD or 5 CARD) = 26/52+4/52-2/52 = 28/52 = 7/13 (Answer)

I hope this helps

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