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In the teacher's pencil box, 13 out of 20 pencils have no eraser, and 12 out of the 20 are not mechanical pencils. There are

In the teacher's pencil box, 13 out of 20 pencils have no eraser, and 12 out of the 20 are not mechanical pencils. There are 4 pencils that are both mechanical and have erasers on them. What is the probability that Ava chooses a pencil at random from the box and gets either a mechanical pencil or a pencil with an eraser?

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