A bag contains 7 blue, 3 green, and 3 red marbles. If Agnes randomly draws two marbles from the bag, replacing the first before drawing the second, what is the probability of drawing a green and then a blue marble?

Step-by-step explanation:

Given:

Number of blue marbles in a bag = 7

Number of green marbles  in a bag = 3

Number of red marbles  in a bag = 3

Agnes randomly draws two marbles from the bag, replacing the first before drawing the second.

To find:

the probability of drawing a green and then a blue marble

Solution:

Let A denotes the event of drawing a green marble and B denotes the event of drawing a blue marble

As Agnes randomly draws two marbles from the bag, replacing the first before drawing the second, so A and B are independent events.

So, the probability of drawing a green and then a blue marble

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.