Abag contains 10 red marbles, 15 yellow marbles,5 green marbles, and 20 blue marbles. two marbles are drawn from the bag. which expression represents the probability that one of the marbles is red and the other is blue?

The expression could be P(R and B) =P(R)*P(B) where two events are independent

The probability will be 4/25

Step-by-step explanation:

You can use the tree diagram to visualize the chances where red and blue marble appear when two marbles are drawn

Given;

P(S)=10+15+5+20=50

Probability of drawing a red , P(R)=10/50

Probability of drawing a blue; P(B)=20/50

From the tree diagram you will notice the probability of drawing a red then a blue occurs at RB and BR

In the first occurrence , RB the probability will be

In the second occurrence, BR the probability will be

Add the two probabilities

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844