A password of a computer used seven digits where they are from 0 and 9. What is the probability that the password solely consists of prime numbers and zero?
Choose the most appropriate option
A) 1/32  B) 1/16  C) 1/8  D) 2/5  E) 1/128
We have seven 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 * 5/10 * 5/10 * 5/10=1/128 (1/128)
<result>E</result>
A password of a computer used seven digits where they are from 0 and 9. What is the probability that the password solely consists of prime numbers and zero?