SOLUTION: how do you know exactly when the problem is a combination or a permutation? how do you label the problem? ex. 4 super script c 3? how do you solve these?

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Question 66432: how do you know exactly when the problem is a combination or a permutation?
how do you label the problem? ex. 4 super script c 3? how do you solve these?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Permutations are a way of counting arrangements:
Example : abc, acb, bac,bca, cab,cba are 6 different arrangements or permutations.
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Combinations are a way of counting the number of groups.
Example: The 6 different arrangements above constitute one group
or one combination.
Example: A bowl contains four marbles: a,b,c,d
How many groups of two are there?
Answer: 8C2 = 8*7/1*2 = 28
Cheers,
Stan H.