Is 123 Toolbox free to use?

Yes. Every tool on 123 Toolbox is free and runs directly in your browser — no account or payment required.

Are my files uploaded to a server?

No. Files and text are processed locally in your browser and are not uploaded by 123 Toolbox, except for a few tools that clearly depend on an external resource.

What kinds of tools are available?

123 Toolbox includes hundreds of tools for PDFs, images, developers, designers, Khmer language, geospatial data, security, math, and everyday work.

Which languages does 123 Toolbox support?

The interface supports English, Khmer, and a bilingual English–Khmer mode.

How do I use Permutation & Combination Calculator?

Enter n (total items) Enter r (chosen items) Read the permutations, combinations, and factorial

Is Permutation & Combination Calculator free to use?

Yes. Permutation & Combination Calculator on 123 Toolbox is free and runs directly in your browser — no account or payment required.

Do I need to install anything to use Permutation & Combination Calculator?

No installation is required. It runs in a modern web browser and processes your input locally on your device.

Is Permutation & Combination Calculator available in Khmer?

Yes. The 123 Toolbox interface supports English, Khmer, and a bilingual English–Khmer mode.

All tools / ឧបករណ៍ទាំងអស់Permutation & Combination Calculator — គណនាការរៀបលំដាប់ និងបន្សំ

Permutation & Combination Calculator

Permutation & Combination ម៉ាស៊ីនគណនា

Compute nPr, nCr, and n! exactly for integers, with the working formula. / គណនា nPr, nCr និង n! យ៉ាងជាក់លាក់សម្រាប់ចំនួនគត់ ព្រមទាំងបង្ហាញរូបមន្ត។

n (total items) / n (ចំនួនធាតុសរុប)r (chosen items) / r (ចំនួនធាតុដែលជ្រើសរើស)

Permutations P(n,r) = n! / (n−r)! / Permutations P(n,r) = n! / (n−r)!

Combinations C(n,r) = n! / (r!(n−r)!) / Combinations C(n,r) = n! / (r!(n−r)!)

Factorial n! / Factorial n!

3,628,800

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Frequently asked questions / សំណួរដែលសួរញឹកញាប់

Compute permutations (nPr), combinations (nCr), and factorials exactly for integers. / គណនាការរៀបលំដាប់ (nPr) ការបន្សំ (nCr) និងហ្វាក់តូរីយែលយ៉ាងជាក់លាក់សម្រាប់ចំនួនគត់។

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