SOLUTION: From the word SECONDARY, How many combinations are there when 5 letters are selected?

Question 1173418: From the word SECONDARY, How many combinations are there when 5 letters are selected?
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.


The word  SECONDARY  has 9 letters, and all 9 letters are different (distinct).


The set of 9 objects has   =  = 126  different subsets of 5 elements (combinations).


ANSWER.  There are   = 126 different possible combinations .

Solved.

---------------

On Combinations, see introductory lessons
    - 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".

Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.

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