Answer: 0.0386
Explanation:
Number of digits = 10
Number of letters in English alphabet = 26
Total number of characters =

Now, if replication is allowed, then the total number of ways to make a ten character password will be :_

The number of ways to make a password having all letters :-

Now, the probability that the password will contain all letters will be :-

Hence, the probability that the password will contain all letters =0.0386