Math

posted by Lola

One bag contains 4 white balls and 3 black balls. If someone draws one ball from the bag and then replaces it and draws another, what is the probability that both will be black?

A: 8/12

B: 9/49

C: 1/6

D: 3/7

1. Reiny

Do you think the balls remember what happened to them on the first draw when you do the second draw ?

What is the prob of drawing a black ball the first time?

2. Lola

Is it A?

3. Reiny

Why do you think it is A? are you guessing?
What is the prob of getting a black in the first draw?

4. Lola

the prob is 3/4 i think

5. Lola

OHHH IS IT D??

6. Reiny

no and no

There are 7 balls in the bag of which 3 are black
So the prob of drawing a black the first time is 3/7

So what will happen the second draw??

7. Lola

Oh b: 9/49

8. Reiny

You got it!!

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