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

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? 
Is it A?

Why do you think it is A? are you guessing?
What is the prob of getting a black in the first draw? 
the prob is 3/4 i think

OHHH IS IT D??

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??
What is the answer to the first question I asked you? 
Oh b: 9/49

You got it!!
Respond to this Question
Similar Questions

******MATH 12*******
How about this. One bad contains 4 white balls and 6 black balls. Another bag contains 8 white balls and 2 black balls. A coin tossed to select a bad, then a ball is randomly selected from that bag. a. What is the probability that … 
Probability
A bag contains 5 white discs and 5 black discs. Two players draw discs from the bag one at a time in turns and do not replace them. Andy goes first and draws a white disc. Beth follows and draws a white disc. (a)What is the probability: … 
FINITE
selection of colored balls from two bags. Assume that each bag contains 4 balls. Bag a contains 2 red and 2 white, while bag b contains 2 red, 1 white, and 1 blue. You randomly select one ball from bag a, note the color, and place … 
MATH 12 HELP!
One bag contains 4 white balls and 6 black balls. Another bag contains 8 white balls and 2 black balls. A coin tossed to select a bad, then a ball is randomly selected from that bag. Suppose white ball was drawn. What is the probability … 
Math (Probability)
An urn A contains 6 white balls and 7 black balls. And urn B contains 8 white balls and 6 black balls. A person draws a ball at random from one of the two urns. It turns out to be black. What is probability that the ball was drawn … 
Math (Probability)
An urn A contains 6 white balls and 7 black balls. And urn B contains 8 white balls and 6 black balls. A person draws a ball at random from one of the two urns. It turns out to be black. What is probability that the ball was drawn … 
probabilities
A bag contains 3 green balls. 2 red balls and a white ball. A boy randomly draws balls from the bag one at a time (with replacement) until a red ball appears. Find the probability that he will make at least 3 draws. 
Maths
Bag A contains 2 white, 1 black and 3 red balls, Bag B contains 3 white, 2 black and 4 red balls and Bag C contains 4 white, 3 black and 2 red balls. One Bag is chosen at random and 2 balls are drawn at random from that Bag. Of the … 
statistics
one bag contains 4 white balls,2 black balls.another bag contains 3 white balls 5 black balls.if one ball is drawn from each bag. find that a) both are white? 
Math
A bag contains 5 red balls, 4 white balls, and 3 black balls. Two balls are drawn without replacement. What is the probability that at least one ball drawn is white?