00:01
Hi, i'm david and i'm here to have you answer your question.
00:04
Now let me bring up your question here.
00:07
In this question suppose box contains five white and seven red.
00:12
So let me summarize the question behind the picture for you.
00:16
We have a box here and it contains five white and seven so it will equal to the 12 bones totally.
00:25
Inside we have the five white and then five white.
00:31
White and the seven red and now we're going to take the two bones randomly and we want without replacement and in the part a the question asks us to find the probability that both bones are white so we're going to have the white and the white for both now first of all we need to know out of the 12 bones how many ways we can choose two bones.
01:05
Each is the combination.
01:07
So we will have from 12 bones we will choose two.
01:11
And now from the set on the five white we're going to choose two white.
01:16
Therefore we will have here will be from five white we will choose two.
01:22
And from the set on the seven red we choose no red.
01:26
Therefore it will be from seven we choose nothing red.
01:30
And if we do the calculation, five, 2 divided by 12, choose 2, get equal to the 0 .1515.
01:41
That will be the part a...