A box contains 40 number tiles numbered 1 to 40. If a tile is drawn at random, what is the probability that the number drawn is a multiple of 3 or 4? Find P(Multiple of 4 or Multiple of 5)
P ( mult 3 or 4) =
P(mult of 3) + P(mult of 4) - P(mult 3 and 4) =
13/40 + 10/40 - 3/40 =
20 / 40 =
1 / 2
P ( mult 4 or 5) =
P ( mult 4) + P (mult 5) - P (mult 4 and 5) =
10/40 + 8/40 - 2/40 =
16 / 40 =
2 / 5
