document.write( "Question 235056: five cards are dealt, what is the probability that the fifth one is a king \n" ); document.write( "
Algebra.Com's Answer #173246 by solver91311(24713)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "Depends on whether you can see the value of the first four or not.\r
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\n" ); document.write( "\n" ); document.write( "If you don't know the value of the first four cards, then there are 4 kings in 52 cards, or .\r
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\n" ); document.write( "\n" ); document.write( "On the other hand, if you can see the first four cards, then the denominator of the fraction changes from 52 to 48, that is 52 minus the 4 cards you can see leaving you 48 cards you don't know about. The numerator is a little more complicated.\r
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\n" ); document.write( "\n" ); document.write( "The numerator of the probability depends on the number of kings that appear in the first 4 cards. Quite obviously, if the first 4 cards are themselves kings, then the probability that the fifth card will be a king is zero -- because there aren't any left.\r
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\n" ); document.write( "\n" ); document.write( "So, let represent the number of kings that appear in the first four cards, then the probability that the fifth card is a king is calculated by the following:\r
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\n" ); document.write( "\n" ); document.write( "and you can say:\r
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