Number on Forehead Riddle
Since, (i) 30 – 20 = 10 (ii) 30 + 20 = 50 You either have 10 or 50 on your forehead. However if case (i) happens & you have 10 on your forehead, the person with number 30 on his forehead can see numbers 10 & 20 following which he knows that...
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