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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.
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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 GMAT problem.
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