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)
Answers
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(a) 6/20
=3/10
(b)2/20
=1/10
(c) 4/20
=1/5
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