Answer:

Step-by-step explanation:
Given

Required
Determine the probability of 6 different lower case letters <em>(Question continuation)</em>
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There are 26 lower case letters.
The first can be any of letters 26
The second can be any of letters 26 - 1
The third can be any of letters 26 - 2
The fourth can be any of letters 26 - 3
The fifth can be any of letters 26 - 4
The sixth can be any of letters 26 - 5
Number of selection is:



The probability is:



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<em> --- approximated</em>