Answer:
2/5 or 8/20
Explanation:
1 pack of red pens:4
2 packs of red pens:8
1 pack of blue pen:3
1 pack of black pen:3
3 packs of black pen: 9
in total there is 20 pens, 8+9=17+3=20
the probability will be 8/20 or 2/5
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