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Slips of Paper in the HAT

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Slips of Paper in the HAT [#permalink] New post 12 Oct 2006, 12:29
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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 a 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?
3
4
5
6
7
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 [#permalink] New post 12 Oct 2006, 12:35
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 a 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?

3 4 5 6 7

to have a sum of 10 on two papers

1+9 , 2+8 , 3+7 , 4+6 only

7 is my answer worst case the first draws are (0,5,1,2,3,4,)

any additional one will give 10

EDITED BECAUSE OF TWO THINGS 1) NEVER RUSH IF U SEE A QUESTION THAT U THINKS IT IS EASY FOR U TO SOLVE ......... FATAL MISTAKE :cry:

2) WE WONT HAVE Ciceron on G day to advice you to concentrate

(though i wish i can :lol: :wink: )

Last edited by yezz on 12 Oct 2006, 12:47, edited 1 time in total.
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 [#permalink] New post 12 Oct 2006, 12:41
Hey Yezz , it must be 7.
Think again...............
_________________

Averages Accelerated:Guide to solve Averages Quickly(with 10 practice problems)

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 [#permalink] New post 12 Oct 2006, 12:50
considering the Worst Case Scenario:
1)
0,1,2,3,4,5,6 -

Till you reach 6, you cannot satisfy the condition given in the Question (2 numbers adding upto 10)

2)9,8,7,6,5,0, 4 -

Same till you reach 4.

So the ans is 7 - (E).
  [#permalink] 12 Oct 2006, 12:50
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