SOLUTION: A computer assigns three-character log-in IDs that may contain the digits 0 to 9 as well as the letters a to z with repeats allowed. what is the probability that the ID will not c

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Question 417903: A computer assigns three-character log-in IDs that may contain the digits 0 to 9 as well as the letters a to z with repeats allowed.
what is the probability that the ID will not contain an x?

Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

total no. of symbol that may be use = 26 + 10 = 36

no. of ways to form 3 character login id = 36*36*36
no. of ways to form login id without using x = 35*35*35

probability = 35^3 / 36^3
= (35/36)^3