A bag has 10 pens in it: 4 black, 3 blue, 2 green and 1 red
1 answer:
So chance to get a black pen: 4/10=2/5
Chance to get a red pen: 1/10
Chance for the two happened at the same time
2/5 * 1/10 = 2/50=1/25
I think... I’m not very sure though
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