Math Is Fun Forum

jclabatt

Guest

Help needed with Permutation and Combinations

To start off, I understand the basic concept of permutation and combinations.
This is my dilemma, I am in the midst of writing an essay about mathematics and I chose to do an evaluation on the possibilities of four letter words (26^4) and the amount that are actually used. I am dwindling down the amount of words possible by looking at certain 'rules' of the English language such as each word must have at least 1 vowel and no real 4 letter has a repetition of a letter three or four times (like aaaa or aaab).
I wasn't sure if there was easy way to make these calculations or if I have to make long calculations for each instance.
Thanks to anyone who can help!

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help needed with Permutation and Combinations

Hi;

You wish to know the number of 4 letter English words?

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