Answer:
7/100
Explanation:
7 yellow, 6 blue, 9 red, and 3 green ribbons in a drawer
Total ribbons = 25 ribbons
P( yellow) = yellow / total = 7/25
Then not replaced
6 yellow, 6 blue, 9 red, and 3 green ribbons in a drawer
Total ribbons = 24 ribbons
P( blue) = blue / total = 6/24 = 1/4
P(a yellow ribbon and then a blue ribbon) = 7/25 * 1/4 =7/100