A password of a computer used four digits where they are from 0 and 9. What is the probability that the password solely consists of prime numbers and zero?
Options.
A) 1/32
B) 1/16
C) 1/8
D) 2/5
E) 1/2
We have four digits can be used for password -0,2,3,5,7.   Assuming that the numbers can be repeated any number of times in the password, probability of selecting any one of them is 5/10 (out of 10 digits from 0-9)   So, 5/10 * 5/10 * 5/10 * 5/10 =1/16 (1/16)
<result>B</result>
A password of a computer used four digits where they are from 0 and 9. What is the probability that the password solely consists of prime numbers and zero?