Question 1
In the following exercises, does the problem involve permutations or combinations? Explain your answer. It is not necessary to solve the problem.
How many different user ID's can be formed from the letters W, X, Y, Z if no repetition of letters is allowed?
◦ Permutations, because the order of the letters matters.
◦ Combinations, because the order of the letters does not matter.
Question 2
In the following exercises, does the problem involve permutations or combinations? Explain your answer. It is not necessary to solve the problem.
Five of a sample of 100 computers will be selected and tested. How many ways are there to make this selection?
◦ Permutations, because the order of the computers selected does matter.
◦ Combinations, because the order of the computers selected does not matter.
Commensalisms that involve cheating.
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