Question

I learned probability a few years ago, but I'm not quite sure how to solve this. Can someone please lend me some knowledge?

Answer 1

the answer will be 1/11

Explanation:

5+2+4+1=12 and 12 two out or 12 of them will be pulled and if you think about it 8 out 4 white marbles

Answer 2

There are 12 marbles in total. 4 of them are white.

The probability of getting a white marble on the first try is 4/12 or 1/3.

The probability of getting a second white marble in a row? Since you already pulled out a white marble on the first attempt, there are now 3 white marbles and 11 marbles in total. So the probability of getting a white marble at this point is 3/11.

Thus the probability of doing this back to back is 1/3 * 3/11 or 3/33 or 1/11.

The answer is B.