Question

A bag contains 5 red, 8 blue, and 7 green marbles. Find P(blue then blue
without replacement).

Answer 1

Explanation:

5(red) marbles+8(blue) marbles+7(green)marbles= 20 total marbles

The probability of getting blue can be written as 8/20 or 4/10

Since you arent replacing any marbles, you have to multiply 4/10*4/10

=4/25

Answer 2

14/95

Explanation:

5 red, 8 blue, and 7 green = 20 marbles

P(blue ) = blue/total = 8/20 = 2/5

No replacement

5 red, 7 blue, and 7 green = 19 marbles

P(blue ) = blue/total = 7/19

P(blue, no replacement, blue) = 2/5* 7/19 =14/95