Then, the total number of ways in which 2 balls can be drawn out 13 of a total of 13 balls is . 2
And, the total number of ways in which 2 white balls can be drawn 10 out of 10 white balls is . 2
Then, the total number of ways in which 2 balls can be drawn out 13 of a total of 13 balls is . 2
And, the total number of ways in which 2 white balls can be drawn 10 out of 10 white balls is . 2