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 8?	Choose one:	A) 1	B) 3	C) 5	D) 4	E) 6
You should consider the worst case scenario: if you pick numbers 0, 1, 2,3 and 4 then no two numbers out of these 5 add up to 8.   Now, the next, 6th number whatever it'll be (5,6,7,8 or 9) will guarantee that two number WILL add up to 8. So, 6 slips must be drawn to ensure that the numbers on two of the slips drawn will have a sum of 8   Answer: 6
<result>E</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 8?