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 Four balls (Posted on 2017-05-19)
There are four balls in a hat: a blue one, a white one, and two red ones. Now I draw simultaneously two balls, look at them, and announce that at least one of them is red.

What is the chance that the other is red as well?

 Submitted by Ady TZIDON Rating: 3.5000 (2 votes) Solution: (Hide) Itâ€™s 1 in 5. Six possible pairings can be drawn from the hat: red 1 / red 2 red 1 / white red 2 / white red 1 / blue red 2 / blue white / blue We know that the last has not been drawn. That leaves 5 possible combinations, so the possibility of red 1 & red 2 is 1 to 5.

 Subject Author Date No Subject Ady TZIDON 2017-08-03 11:32:14 The real solution Math Man 2017-05-24 09:30:46 re(2): There is only one correct answer !....SPOILER Ady TZIDON 2017-05-22 17:26:35 re: There is only one correct answer !....SPOILER Brian Smith 2017-05-22 12:05:40 re: There is only one correct answer ! (Baye) hoodat 2017-05-22 10:54:54 re(3): Who's right Ady TZIDON 2017-05-22 03:06:48 There is only one correct answer !....SPOILER Ady TZIDON 2017-05-22 03:02:19 re(5): Who's right Brian Smith 2017-05-21 23:17:59 re(4): Who's right Charlie 2017-05-21 22:13:24 re(3): Who's right Brian Smith 2017-05-21 17:15:20 re(2): Who's right Charlie 2017-05-21 16:37:54 re: Who's right hoodat 2017-05-20 20:59:15 re(2): Who's right?.......I AM. Ady TZIDON 2017-05-20 09:38:02 re: Who's right? broll 2017-05-20 02:56:51 Who's right? Ady TZIDON 2017-05-20 00:41:00 re(2): I agree with Brian Daniel 2017-05-19 23:38:41 Solution hoodat 2017-05-19 23:10:27 re: I agree with Brian Charlie 2017-05-19 23:01:06 I agree with Brian Steve Herman 2017-05-19 13:28:44 Solution Brian Smith 2017-05-19 12:43:07 Solution Jer 2017-05-19 11:56:13 Solution Charlie 2017-05-19 11:00:34

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