George0305
New member
- Joined
- Jan 12, 2019
- Messages
- 2
Hello! I can`t find the solution to a problem from a certain point. The problem:
From a box containing n=white marbles, m=black marbles and p=red marbles, we get a marble at a time, check its color and place it back in the box until we get 'x' iterations of white marbles.
s=the number of marbles retrieved. We need to calculate the probability L={the number of black marbles retrieved is bigger than the red ones}.
Until now, i replaced n, m and p with values - 2, 2, 10 (from a similar problem) so i could get a rough formula(but i couldn`t). I found that 1/7 is the chance to get a white ball, and 1/49 is the chance to get 2 white balls one after the other(unnecessary i think) and this is where i`m stuck at.
Thank you!
From a box containing n=white marbles, m=black marbles and p=red marbles, we get a marble at a time, check its color and place it back in the box until we get 'x' iterations of white marbles.
s=the number of marbles retrieved. We need to calculate the probability L={the number of black marbles retrieved is bigger than the red ones}.
Until now, i replaced n, m and p with values - 2, 2, 10 (from a similar problem) so i could get a rough formula(but i couldn`t). I found that 1/7 is the chance to get a white ball, and 1/49 is the chance to get 2 white balls one after the other(unnecessary i think) and this is where i`m stuck at.
Thank you!
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