Question

There are 3 red, 5 green, 7 blue, 1 black and 4 yellow marbles in a bag. Once a marble is selected, it is not replaced. Find the probability of selecting a green

marble, then a red marble.



Note: please explain if you get the answer

Answer 1

Answer: 3/76

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Step-by-step explanation:

There are 5 green marbles.

There are 3+5+7+1+4 = 20 marbles total.

The fraction 5/20 = 1/4 represents the probability of picking green.

After that marble is selected, it is not put back (i.e. "no replacement").

This means we now have 20-1 = 19 marbles left.

The probability of getting red on the second selection is 3/19 because we have 3 red out of 19 leftover.

The last step is to multiply the fractions mentioned:

(1/4)*(3/19) = (1*3)/(4*19) = 3/76