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 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 13?	Select
A) 3	B) 4	C) 5	D) 8	E) 7
i'm not sure i got the question right, if it is what i think it is, then 8 should be the right answer   0,1,2,3,4,5, will not have 2 slip sum of 13 add another (either 6,7,8 or 9) and we'll have a pair with sum 13   Ans:8
<result>D</result>
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 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 13?