Each of the integers from 0 to 8, 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 9? Choose one:
A) 3
B) 4
C) 5
D) 6
E) 7
Answer is 6. In the worst case, you could end up drawing 0,1,2,3,4,5. th draw will result in either of 6,7,8 which would result in the numbers adding to 9.   6
<result>D</result>
Each of the integers from 0 to 8, 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 9?