IQ Test - here is another

[EternalOptimist]

No 1 shouts out blue as 2 and 3 are both wearing red earphones


I'm fine thanks

eh ?

2 = blue
3 = red

[Pogle]

eh ?

2 = blue
3 = red

- RTFM Pogle !

[OrangeHopper]

As with television programs, every word is there for a reason. In this case, one apparently pointless line in the scenario.

[EternalOptimist]

As with television programs, every word is there for a reason.

oooohh
a clue

[RichardCranium]

2 shouted "Blue" because 1 didn't immediately shout "Blue".

[EternalOptimist]

2 shouted "Blue" because 1 didn't immediately shout "Blue".

no

[OrangeHopper]

Need he have shouted blue?

[EternalOptimist]

2 shouted "Blue" because 1 didn't immediately shout "Blue".

sorry
i mean yes

[TimberWolf]

sorry
i mean yes

Not quite. 2 knows that himself and 3 are not the same colour because no.1 would have immediately shouted out his colour if he saw they were the same (shouting the opposite colour). So no.2, seeing 3 has red, knows that he is blue.

[On the other hand if 1 is a sneaky sort, he could keep quiet and make 2 look a twit. 2 on the other hand could take that into account and keep schtum]

[OrangeHopper]

Isn't ....

1-> 2-> 3-> ||| <-4
Blue Red Blue barrier Red

... equally valid from the scenario?