Combinations (n choose r): 15 n n; 1 r r
Specific conversion page with reference context, calculator, and nearby values.
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15 n n; 1 r r converts to
15 Combination Count
Use this as a quick reference for Combinations (n choose r).
Value Details
Input: 15 n n; 1 r r
Output: 15 Combination Count
Combinations (n choose r)
Calculate the number of combinations using nCr for integers with 0 ≤ r ≤ n ≤ 18.
Calculated Result
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Nearby Reference Values
| Scenario | nCr |
|---|---|
| 12 n n; 5 r r | 792 Combination Count |
| 12 n n; 6 r r | 924 Combination Count |
| 12 n n; 11 r r | 12 Combination Count |
| 12 n n; 12 r r | 1 Combination Count |
| 15 n n; 0 r r | 1 Combination Count |
| 15 n n; 1 r r | 15 Combination Count |
| 15 n n; 2 r r | 105 Combination Count |
| 15 n n; 3 r r | 455 Combination Count |
| 15 n n; 4 r r | 1,365 Combination Count |
| 15 n n; 5 r r | 3,003 Combination Count |
| 15 n n; 6 r r | 5,005 Combination Count |
Frequently Asked Questions
Common questions about Combinations (n choose r), formulas, and expected usage.
What does the Combinations (n choose r) calculator do?
It helps with counting selections where order does not matter in combinatorics and probability.
What formula does the Combinations (n choose r) calculator use?
nCr = n! / (r!(n-r)!), computed iteratively for stable exact integer results in range.
What inputs are valid?
n and r must be integers with 0 ≤ r ≤ n ≤ 18.
When would I use this?
counting selections where order does not matter in combinatorics and probability
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