Question

A set of 20 cards is numbered 1,2,3,…..,20. Suppose one person draws a card at

random without looking. Find the probability of the following events. Write your

answer as a fraction in simplest form.

(a) P(multiple of 3) (b) P( 2 or 6) (c) P (not a factor of 10)​

Answer 1

(a) 6/20

=3/10

(b)2/20

=1/10

(c) 4/20

=1/5