Find the probability that a number selected at random from 21 to 34 is a multiple of 3
-
A.
(frac{3}{11}) -
B.
(frac{2}{9}) -
C.
(frac{5}{14}) -
D.
(frac{5}{13})
Correct Answer: Option C
Explanation
S = {21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34}
n(S) = 14
multiples of 3 = {21, 24, 27, 30, 33}
n(multiples of 3) = 5
Prob( picking a multiple of 3) = 5/14
There is an explanation video available below.