Combinations (unordered selection) (C(n,r) = n!/(r!(n−r)!): order does not matter)
jee-mainjee-advanced
C(n,r) = n!/(r!(n−r)!) — order does not matter
What each symbol means
| Symbol | What it stands for |
|---|---|
| n | Distinct objects |
| r | Size of subset chosen |
| C(n,r) | Binomial coefficient / combinations |
When to use this
Integers 0 ≤ r ≤ n. Define C(n,0)=1.