SOLUTION: how to know that the permutations and combinations in questions

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Question 1090226: how to know that the permutations and combinations in questions
Found 2 solutions by Fombitz, ikleyn:
Answer by Fombitz(32388)   (Show Source):
You can put this solution on YOUR website!
Can you re-phrase your question?
Like it is, it doesn't make sense.
Please repost.

Answer by ikleyn(52754)   (Show Source):
You can put this solution on YOUR website!
.
On permutations and combinations, see the lessons
    - Introduction to Permutations
    - PROOF of the formula on the number of Permutations
    - Problems on Permutations
    - Introduction to Combinations
    - PROOF of the formula on the number of Combinations
    - Problems on Combinations
    - OVERVIEW of lessons on Permutations and Combinations
in this site.

Also, you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Combinatorics: Combinations and permutations".