+16 How many six-letter "words" (strings of letters) can be formed using the 26 letters of the alphabet if repetition of letters is allowed or is not allowed?
+1009 If we have repeat-ok,
then it's 26^6 since there's 26 letters to pick from for each.
If not...
We have 26*25*24*23*22*21
SINCE it's 26 letters for first, 26-1 because one is taken, etc
If you don't understand anything feel free to ask.
How many six-letter "words" (strings of letters) can be formed using the 26 letters of the alphabet if repetition of letters is allowed or is not allowed?
If the order or position of the letters is NOT important, such as:MASFLD, which is just a "string" of 6 letters, then it is a "combination" and NOT a "permutation" problem.
1 - With repeats allowed, then you should have:
[26 + 6 - 1] C 6 =31 C 6 =736,281 combinations.
2 - With repeats not allowed, then it is simply:
26 C 6 =230,230 combinations.
