Suppose a jar is filled with 7 red marbles and 3 green marbles. What is the probability of pulling out 2 green marbles in a row if the marbles are not replaced after they're pulled out

Step-by-step explanation:

We have been given that a jar is filled with 7 red marbles and 3 green marbles. We are asked to find the probability of pulling out 2 green marbles in a row if the marbles are not replaced after they're pulled out.

The probability of pulling 1st green marble will be number of green marbles divided by total marbles.

Since the marble is not replaced, so number of total green marbles will be 1 and total marbles will be 9.

Probability of getting green marble for another time will be .

To find probability of getting 2 green marbles in a row would be product of both probabilities as:

Therefore, our required probability would be .

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)