Hello Rakshit Sinha. I think it should be: 2 knows that 1 would shout if 2 and 3 had hats the same colour. If 2 and 3 both had had white hats, 1 would've shouted "black", and if 2 and 3 both had had black hats,1 would've shouted "white".
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Thomas TompionYou start using the present tense, but then shift, in places, into the past. I've put it into the present, but I could have put it into the past. You should be consistent, and not use the past in some places and the present in others, in this sort of explanation.Thank you so much Thomas Tompion for taking the efforts to write the entire paragrap