Question

There are two boxes containing 5 white and 6 blue balls and 3 white and 7 blue balls if one of the box is selected random and a ball drawn then probability that the ball is blue

Answer 1

21/110 is the answer. hope it helps : )
6/11 × 7/10 × 1/2 as we select one of the two boxes.

Answer 2

Answer:

$\frac{13}{21}$

Step-by-step explanation:

First box:

No. of white balls = 5

No. of blue balls = 6

Second box:

No. of white balls = 3

No. of blue balls = 7

So, Total no. of white balls = 8

Total no. of blue balls = 13

So, Total no. of balls = 8+13=21

Now probability of getting blue ball : $\frac{\text{No. of blue balls}}{\text{Total No. of balls}}$

                                                           =$\frac{13}{21}$

Hence the probability of getting blue ball is $\frac{13}{21}$