

800score Tip:
Half of the challenge in most combination/permutation questions is correctly identifying if it is a combination or permutation question. Once you know this, most become easy.



1. Does order matter?
“Does it
matter if the two items (or however many items you have) positions are changed?”
If the answer is yes, it is a permutations problem, if not, it is a combinations
problem.
2. If the word “arrangements” is in the problem, it is
a permutations problem.
The term “permutations” will
rarely be in a GRE problem.
3. If the word “combinations” is in the problem, it is a combinations problem.
Don't think it'll be that easy often!
Here are 7 examples each of permutations and combinations. Read through them
and try to think out each one. You will soon see the difference between permutations
and combinations
.
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