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Envelopes (Posted on 2003-04-10) Difficulty: 2 of 5
There are three envelopes and exactly two statements are written on each of the envelopes. The statements on one of the envelopes are BOTH TRUE, the statements on the other envelope are BOTH FALSE and the remaining envelope has ONE TRUE and ONE FALSE statement. Here is what is written on the three envelopes:

First Envelope:
(a)The formula is not in here.
(b)The formula is in Envelope 2.

Second Envelope:
(a)The formula is not in Envelope 1.
(b)The formula is in Envelope 3.

Third Envelope:
(a)The formula is not in here.
(b)The formula is in Envelope 1.

Which envelope contains the formula ?

See The Solution Submitted by Ravi Raja    
Rating: 2.9091 (11 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionSolution without using case-by-case analysisBrian Smith2017-01-02 14:03:56
A different methodGamer2008-04-06 15:20:38
SolutionSearch, FindFrankM2008-04-06 09:37:32
AnswerPraneeth2007-08-29 06:45:12
SolutionBob2005-03-09 22:24:24
I got itJohn2004-09-19 03:27:30
SolutionSolutionLewis2003-07-25 22:26:41
re(4): this is easyRavi Raja2003-04-30 19:34:10
re(3): this is easyMichael2003-04-23 23:10:16
Explanation...Tim Axoy2003-04-17 11:33:26
re(2): this is easyRavi Raja2003-04-15 21:57:40
re: this is easyRavi Raja2003-04-15 21:45:24
re: this is easySteven2003-04-15 06:53:38
this is easytony2003-04-14 10:38:09
re: 1 and 2,true and true.Ravi Raja2003-04-13 04:54:38
re: Hunting for the formulaRavi Raja2003-04-13 04:48:23
re: HAHA! i think i got itRavi Raja2003-04-13 04:44:30
Solution1 and 2,true and true.Tim Axoy2003-04-13 04:21:59
re(2): SolutionRavi Raja2003-04-13 04:19:49
SolutionHunting for the formulaTim Axoy2003-04-13 04:18:55
re: My thoughtRavi Raja2003-04-13 04:15:20
re(2): Is it that straightforward?Ravi Raja2003-04-13 04:07:12
re: Is it that straightforward?Ravi Raja2003-04-13 04:05:20
SolutionHAHA! i think i got itSteven2003-04-12 20:13:52
re: solutionSteven2003-04-12 20:03:27
re: Solutionjohn2003-04-12 15:42:41
re: easy way to solve this type of problemjohn2003-04-12 15:38:49
My thoughtJessica Price2003-04-11 21:04:38
re: Is it that straightforward?Andrew F2003-04-11 17:30:45
Is it that straightforward?Andrew F2003-04-11 17:20:55
re: solutionRavi Raja2003-04-10 22:24:08
easy way to solve this type of problemJon2003-04-10 10:03:22
re: solutionaustin2003-04-10 08:19:19
solutionaustin2003-04-10 08:13:20
entertainingThe Mighty Puck2003-04-10 06:45:27
SolutionanswerDuCk2003-04-10 03:08:08
SolutionSolutionDJ2003-04-10 02:51:15
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