number of strings of $5$ lower case letters $a\cdots z$ that do not contain any letter twice or more

Question

What are the number of strings of $5$ lower case letters $a\cdots z$ that do not contain any letter twice or more?

I think it would be $26*25*24*23*22$ because the first position can be filled in $26$ ways because there are $26$ possible lowercase characters; the second one in $25$ ways and so on

Does this answer your question? How to find the number of $k$-permutations of $n$ objects with $x$ types, and $r_1, r_2, r_3, \cdots , r_x$ = the number of each type of object? — , Jan 06 '22 at 08:47

score 1 · Answer 1 · answered Apr 25 '16 at 09:05

1

community wiki answer so the question can be closed

Your answer is correct.

answered Apr 25 '16 at 09:05

N. F. Taussig

76,571

number of strings of $5$ lower case letters $a\cdots z$ that do not contain any letter twice or more

1 Answers1