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You and i each have two prime numbers on our foreheads And are told that any three of them form the sides of a triangle With prime perimeter. we take turns stating whether we can deduce the Numbers on our own foreheads. You see 13 and 17 on my forehead and each of us has stated "don't know" on each of our first two turns. It is now Your third turn. what are the numbers on your forehead?

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7 and 11 will be the answer as 7,11,13,17 any 3 of them on addition gives a prime no.(perimeter) and the sum of any 2 is greater than the 3rd so they can be sides of a triangle....
10 years agoHelpfull: Yes(0) No(0)

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