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## help123please. 2 years ago Joe has 4 red pens, 1 green pen, 2 blue pens, and 3 black pens. What is the probability he will randomly select a black pen and then,without replacing it, randomly selecti a blue pen?

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1. help123please.

@AriPotta

2. AriPotta

OH I'M SORRY. I'M NOT GOOD WITH PROBABILITY

3. help123please.

ITS OK ARI

4. RadEn

P(Black) = 3/10 P(Blue) = 2/9 multiply of both

5. electrokid

event A: selecting "1" black from a total of (4+1+2+3)=10; $P(A)={3\over10}$ event B: selecting "1" blue from the remainning "9" $P(B)={2\over9}$ now, the events are mutually independent... $P(A\cap B)=P(A)\times P(B)={3\over10}\times{2\over9}$

6. help123please.

Oh, ok, thanks!

7. help123please.

IDK who to give BEST ANSWER to. LOL.

8. electrokid

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