Quote:
Originally Posted by Bilbo1967
I'll guess at (c), for no other reason than I don't think it can be (a), because if it is (a), then (b) must be true as well. After that I can't get the logic straight in my head between (b) and (c), so I will just guess at one of them.
(Getting out my bus timetable if I get to set the next question  ). |
I'm not sure that guesses count, but you're right.
The important thing is that only one of the answers is correct.
A can't be that one, because is A is correct then B is correct too.
B can't be that one, because if B is correct then C is correct too.
C is the only correct answer. A and B are not correct.
You can work it out using boolean logic. We know that only one is true.
Try A=TRUE, B=FALSE, C=FALSE. Substitute in and we get
A: TRUE
B: TRUE or FALSE = TRUE
C: FALSE or FALSE = FALSE
which is a contradiction, as we assumed B=FALSE and we find B=TRUE
Try A=FALSE, B=TRUE, C=FALSE.
A: FALSE
B: FALSE or TRUE = TRUE
C: TRUE or FALSE = TRUE
another contradiction, as we assumed C=FALSE and we find C=TRUE
Try A=FALSE, B=FALSE, C=TRUE:
A: FALSE
B: FALSE or FALSE = FALSE
C: FALSE or TRUE = TRUE
No contradictions, the right answer is C.
Over to you, Bilbo...