4 choose 2
Choosing 2 from 4— order doesn't matter.
Combinations (order doesn't matter)
4C2 = 6
Permutations (order matters): 4P2 = 12
There are 6 ways to choose 2 items from 4when order doesn't matter, using the formula C(n, k) = n! / (k! · (n − k)!).
4 choose k table
| Expression | Combinations |
|---|---|
| 4 choose 0 | 1 |
| 4 choose 1 | 4 |
| 4 choose 2 | 6 |
| 4 choose 3 | 4 |
| 4 choose 4 | 1 |
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Frequently asked questions
What is 4 choose 2?+
4 choose 2 equals 6. It counts the number of ways to choose 2 items from 4 when the order does not matter.
What is the formula for 4 choose 2?+
The combinations formula is C(n, k) = n! / (k! · (n − k)!). For 4 choose 2: 4! / (2! · 2!) = 6.