Each of the integers from 3 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?
Choose the correct choice from the following answers:
A) 3	B) 4	C) 5	D) 6	E) 7
Answer is 4. In the worst case, you could end up drawing 3,4,5. 7th draw will result in either of 6,7,8,9 which would result in the numbers adding to 10.   4
<result>B</result>
Each of the integers from 3 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?