Permutations Calculator
Calculate the number of permutations P(n, r) — the number of ways to arrange r items chosen from n total items where order matters.
How to Use the Permutations Calculator
- Enter your data set or statistical values in the input fields.
- Click Calculate to process the data.
- Review the computed result with detailed breakdown.
- Modify inputs or add more data points for further analysis.
مرجع سريع
| من | إلى |
|---|---|
| Mean [2,4,6] | 4 |
| Median [1,3,5,7] | 4 |
| Mode [2,2,3,5] | 2 |
| σ [2,4,4,4,5,5,7,9] | 2 |
| z-score (x=85, μ=70, σ=10) | 1.5 |
| P(A)+P(B)−P(A∩B) | P(A∪B) |
حالات الاستخدام
- •Analyzing data sets for research papers or school projects.
- •Checking statistical calculations before including them in reports.
- •Understanding data distributions and variability in experiments.
- •Making data-driven decisions in business or academic contexts.
الصيغة
P(n, r) = n! / (n−r)!, where n is the total number of items and r is the number chosen. Order matters in permutations.
الأسئلة الشائعة
What is a permutation?
A permutation is an ordered arrangement of items. P(n, r) counts the ways to arrange r items selected from n, where order matters.
What is the difference between permutations and combinations?
Permutations count ordered arrangements (AB ≠ BA). Combinations count unordered selections (AB = BA).
What does n! (factorial) mean?
n! = n × (n−1) × (n−2) × … × 1. For example, 5! = 120.
Can r be greater than n?
No. You cannot choose more items than available, so n must be greater than or equal to r.