 |
| |
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
.
This is a partial free sample of our prep guide. To view the remainder of this page, purchase the 800score.com Prep Course.
|
