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# In a deck of cards there are 52 cards numbered from 1 to 13.

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Senior Manager
Joined: 13 Jun 2005
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In a deck of cards there are 52 cards numbered from 1 to 13. [#permalink]

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28 Jan 2006, 09:01
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100% (01:35) correct 0% (00:00) wrong based on 6 sessions

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In a deck of cards there are 52 cards numbered from 1 to 13. There are 4 cards of each number in the deck. If you insert 12 more cards with the number 10 on them and you shuffle the deck really good, what is the probability to pull out a card with a number 10 on it?

a) 1/4.
b) 4/17.
c) 5/29.
d) 4/13.
e) 1/3.
Senior Manager
Joined: 13 Jun 2005
Posts: 252
Location: Haverhill, MA
Followers: 1

Kudos [?]: 17 [0], given: 0

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28 Jan 2006, 19:02
The total number of cards in the new deck is 12 +52 = 64.
There are (4 + 12 = 16) cards with the number 10.
The probability of drawing a 10 numbered card is 16/64 = 1/4.
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28 Jan 2006, 21:51
Total number of cards now becomes 52+12 = 64

Number of '10' cards now becomes = 4+12 = 16

P = 16/64 = 4/16 = 1/4
28 Jan 2006, 21:51
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