Question

eremy randomly selected a round tile and a square tile from the sets shown below. What is the probability that Jeremy selected either two blue tiles or two white tiles?
Square tiles: 10 pink, 8 red, 6 blue, 12 green, 8 black, 9 white, 7 yellow.Round tiles: 11 green, 5 red, 2 white, 4 black, 6 blue, 8 pink.
a.
23/36
b.
4/9
c.
7/72
d.
1/40

Answer 1

Total square tiles = 60, total round tiles = 36.

P(both blue) = (square blue)(round blue) = (6/60)(6/36) = (1/10)(1/6) = 1/60.
P(both white) = (9/60)(2/36) = (3/20)(1/18) = 1/120.

P(either both blue or both white) = 1/60 + 1/120 = 3/120 = 1/40.

Answer: d.