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Math Magic – Cards
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Probability With A Deck Of Cards:
A. Sometimes a number sense test will ask for the probability of drawing a particular
card from a deck of 52 cards, or they might say from a standard deck (which is the
same thing). There are many patterns that develop.
B. If the question is talking about more than one card, they might use the phrase "with
replacement" or "without replacement". If no phrase is used, it is assumed "without
replacement". If additional cards are drawn "with replacement", then the card is put
back before drawing the next card, otherwise it is not.
C. If drawing only one card:
1. The probability of drawing a specific card is
1
/
52
.
2. The probability of drawing a specific number (or specific face card) is
4
/
52
or
1
/
13
.
3. The probability of drawing a specific suit (club, spade, diamond, or heart)
is
13
/
52
or
1
/
4
.
D. If drawing more than one card with replacement:
1. The probability of drawing a specific card each time is
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 Spring '09
 mr.chuck

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