Each of the integers from 2 to 9, inclusive, is written on a separate slip of blank paper and the ...
Each of the integers from 2 to 9, inclusive, is written on a separate slip of blank paper and the ten slips are dropped into 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?
Answer/Solution
5
Steps/Work
Answer is 5. In the worst case, you could end up drawing 2,3,4,5. 7th draw will result in either of 6,7,8,9 which would result in the numbers adding to 10.
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