Question

(Disjoint vs. overlapping events) If you are picking a number between 1-20 what is the probability that you will pick a number greater than 14 or less than 4?

Answer 1

9/20

the numbers that would satisfy this are 15,16,17,18,19,20, 1,2,3

so there are 9/20

Answer 2

greater than 14 = 6/20
less than 4 = 3/20
add them together: 6/20+3/20= 9/20