Nah

I think you will just have to list out all combinations and see if they are a triangle

3, 5, 7 - triangle

3, 5, 9 - not triangle

3, 5, 11 - not triangle

3, 7, 9 - triangle

3, 7, 11 - not triangle

3, 9, 11 - triangle

5, 7, 9 - triangle

5, 7, 11 - triangle

5, 9, 11 - triangle

7, 9, 11 - triangle

P = 7/10 = 0.7

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