1. The strategy is that they should agree to write down the same colour(either red or black), irrespective of what they see on the opposite persons forehead
2. Same as above. This time all of them should agree to write any single suit.
By probability, at least one of them will get it right.
1. The strategy is that they should agree to write down the same colour(either red or black), irrespective of what they see on the opposite persons forehead
2. Same as above. This time all of them should agree to write any single suit.
By probability, at least one of them will get it right.
[Edit]: Didn't put it correctly before