Kalkulator pilih atur dan gabungan
Kira nPr, nCr dan faktorial.
Berjalan dalam pelayar anda. Fail anda tidak pernah meninggalkan peranti. Lihat cara menyemaknya
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Cara melakukannya
- 1Isi ruang
Taip nombor anda atau pilih pilihan yang diperlukan.
- 2Lihat hasil
Jawapan dikemas kini serta-merta apabila anda menukar nilai.
- 3Gunakan
Salin hasil atau catatkannya. Tiada apa dihantar ke mana-mana.
About this tool
Enter n, the number of items, and r, how many you choose. You get nPr (permutations), nCr (combinations), n factorial, and the counts when repeats are allowed. Handy for probability, schedules and lottery questions.
When to use it
Work out nPr, nCr and factorials.
Tips
Order matters for permutations, not for combinations.
Privacy
Everything runs in your browser, so your data is not uploaded or stored.
Choosing the right one
Use permutations when the order matters, such as a race podium or a PIN. Use combinations when it does not, such as choosing a committee. nCr is always smaller than or equal to nPr.
Contoh berselesaian
With the boxes at their starting values (n (total items): 10; r (items chosen): 3), the tool shows: n factorial (n!): 3,628,800; Permutations with repetition (nʳ): 1,000; Combinations with repetition: 220; Permutations nPr: 720; Combinations nCr: 120. Change any box to see your own numbers. The result updates as you type, and nothing leaves your browser.
Petua untuk hasil terbaik
Semak setiap ruang sebelum mempercayai hasil, kerana satu angka yang salah mengubah keseluruhan jawapan. Gunakan nombor tepat daripada slip gaji, bil, sijil atau kontrak dan catat tarikh anda mengira. Kadar, ambang dan peraturan berubah dari semasa ke semasa, jadi untuk cukai, yuran dan perkara undang-undang, anggap hasil sebagai anggaran dan sahkannya dengan sumber rasmi yang dinyatakan pada halaman ini. Anda boleh mencuba sebanyak mana senario; tiada apa disimpan atau dihantar dan memuat semula halaman mengosongkan ruang.
Ringkasnya
- Kategori: Alat harian
- Berjalan dalam pelayar, tanpa pendaftaran, tanpa muat naik.
- Maklumat yang anda masukkan kekal pada peranti anda.
- Tersedia dalam banyak bahasa.
- Kandungan disemak kali terakhir:
Soalan lazim
What is the difference between nPr and nCr?
nPr counts ordered arrangements. nCr counts groups where order does not matter, so it is always smaller or equal.
What are the limits?
n up to 170 and r not larger than n.
What is nCr?
The number of ways to choose r items from n without order.
What is nPr?
The number of ordered arrangements of r from n.
What is a factorial?
n! is the product of all whole numbers from 1 to n, for example 5! is 120.