You walk into a pitch black room with a dresser. In the dresser there are 11 red socks and 22 blue socks.
What's the minimum number of socks you need to pull out to guarentee that you have one matching pair?
2006-09-09 01:19:56 · 13 answers · asked by jeepnuk 4 in Science & Mathematics ➔ Mathematics
consider u took a red sock first
now second time u took any color out,
after third chance u will surely have one pair as there are only 2 kinds of socks.
if first is red, second is blue, third is either red or blue will give u a matching pair!!
so minimum number is 3.
2006-09-09 01:51:13 · answer #1 · answered by pragyp 2 · 1⤊ 0⤋
3
2006-09-09 08:36:33 · answer #2 · answered by llloki00001 5 · 0⤊ 0⤋
3
2006-09-09 08:22:44 · answer #3 · answered by dennismeng90 6 · 0⤊ 0⤋
12
2006-09-09 08:24:43 · answer #4 · answered by bobsdidi 5 · 0⤊ 0⤋
13
2006-09-09 08:26:04 · answer #5 · answered by skyeblue 5 · 0⤊ 0⤋
Three—after you have one and you get another, you have a pair which may or may not match, but when you pull out the third, it is guaranteed that it will match either the first or second sock, and you will have a matching pair.
2006-09-09 08:52:53 · answer #6 · answered by DrB 7 · 0⤊ 0⤋
23
Because you have to consider the worst case scenario:
You pull all 22 blue socks first, only then are you guaranteed to get a red one.
2006-09-09 08:25:21 · answer #7 · answered by Marianna 6 · 0⤊ 0⤋
minimum number of socks that you have to pick is three. Two of them should definetley match.
2006-09-09 10:17:32 · answer #8 · answered by atom45 4 · 0⤊ 0⤋
Three
2006-09-09 09:03:15 · answer #9 · answered by sunil 3 · 0⤊ 0⤋
The minimum number is two, if you get lucky.
Three, if you have to try again.
2006-09-09 09:17:37 · answer #10 · answered by Lucianna 6 · 0⤊ 0⤋