Question

A box contains 20 slips of paper. 8 of them are blue and are number from 1 to 8. 12 of them are pink and are number from 9 to 20.
a) Find the probability of selecting a pink card or a multiple of 4.
b) Find the probability of selecting a blue card or a card with the number 18 on it.

Answer 1

Multiples of 4: 4, 8, 12, 16, 20

Answer 2

Probability of selecting a pink card: \[\frac{ 12 }{ 20 }\]Probability of selecting a multiple of 4: \[\frac{ 5 }{ 20 }\]Multiply the 2 probabilities to get the one probability:\[\frac{ 12 }{ 20 }\times \frac{ 5 }{ 20 }=\frac{ 3 }{ 20 }\]

Answer 3

Probability of selecting a blue card: \[\frac{ 8 }{ 20 }\]Probability of selecting the card with 18 on it: \[\frac{ 1 }{ 20 }\]Multiply the 2 probabilities to get one probability: \[\frac{ 8 }{ 20 }\times \frac{ 1 }{ 20 }=\frac{ 1 }{ 50 }\]

Answer 4

Thank you so much & for explaining it! :)

Answer 5

No problem. :)