Three young men stand against a wall talking while one young boy looks forward holding a poster .
It is improbable that 3 brothers stand up against a wall while the 4th brother holds a poster .
It is probable that 3 brothers stand up against a wall while the 4th brother holds a poster .
It is improbable that 3 brothers stand up against a wall while the 4th brother holds a poster .
3 brothers stand up against a wall while the 4th brother holds a poster .