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You can quickly tell if it is possible to draw a triangle if you can add up any two numbers and they are greater than the remaining value because if your base is greater than the other two together they will not meet. In the one player game you are more likely to win than lose. In the two player game the best number to choose is one because for all of the pairs to be greater than the other number the other two values that player B picks would have to be the same as each other