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18 points are indicated on the perimeter of a triangle ABC . If three points are choosen probability it will form a triangle. `(331)/(816)` (b) `1/2` (c) `(355)/(408)` (d) `(711)/(816)`

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18 points are indicated on the perimeter of a triangle ABC (see figure). If three points are choosen probability it will form a triangle. Figure (331)/(816) (b) 1/2 (c) (355)/(408) (d) (711)/(816)

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