Answer:
5) 2/5
6) 9/25
7) 8/33
Explanation:
5) P(red) = 1/5
P(pink) = 1/5
P(red or pink) = 1/5 + 1/5 = 2/5
6) total marbles = 12 + 8 = 20
P(blue) = 12/20 = 3/5
P(blue and blue) = 3/5 x 3/5 = 9/25
7) total gumballs = 8 + 14 = 22
P(red) = 14/22
Now total gumballs = 22 - 1 = 21 (comprising 8 blue and 13 red)
p(blue) = 8/21
P(red and blue) = 14/22 x 8/21 = 112/462 = 8/33