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Each of the integers from 0 to 9, inclusive, is written on a [#permalink]
16 Oct 2005, 00:57

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Question Stats:

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Each of the integers from 0 to 9, inclusive, is written on a separate slip of blank paper and the ten slips are dropped into a hat. If the slips are then drawn one at a time without replacement, how many must be drawn to ensure that the numbers on two of the slips drawn will have a sum of 10?

take out: 0,1,2,3,4,5, and 6 to make sure you have 10 from 2 of the drawing. now only 6+4 or 6+5 makes 10 or more than 10.

ah yes, i fail to read this last line "how many must be drawn to ensure that the numbers on two of the slips drawn will have a sum of 10? " and was too hasty in solving

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