Binomial coefficient C(n,k)
Exact integer arithmetic for moderate n—overflow if n is very large.
ClientNearby workflows on Toolcore
- Combinations & permutations — Calculate nCr and nPr for counting problems—BigInt combinatorics in your browser. when units or numeric output should be checked on a related calculator.
- Factorial calculator — Compute n! for whole numbers up to 500—BigInt factorial in your browser, no upload. when units or numeric output should be checked on a related calculator.
- JSON formatter — JSON format online: pretty-print, minify, validate, escape, download . when units or numeric output should be checked on a related calculator.
- Encoding tools — Hub index: Base64 & URL, Base64url, Base32, Crockford, LEB128, ASCII85, Z85, Base58, base-36, bencode, Morse, quoted-printable, URI, Puny… when units or numeric output should be checked on a related calculator.
Common use cases
- Binomial coefficient C(n,k) for quick local checks without uploading data.
- Copy results into tickets, docs, or classroom notes.
Common mistakes to avoid
Unexpected input shape
See the intro and how-to notes for accepted formats.
FAQ
Is processing local?
Yes—this runs entirely in your browser.
Agent prefill?
Open the page directly—multi-field inputs are not URL-prefilled.
More tools
Related utilities you can open in another tab—mostly client-side.
Combinations & permutations
ClientCalculate nCr and nPr for counting problems—BigInt combinatorics in your browser.
Factorial calculator
ClientCompute n! for whole numbers up to 500—BigInt factorial in your browser, no upload.
JSON formatter
ClientJSON format online: pretty-print, minify, validate, escape, download .json.
Encoding tools
ClientHub index: Base64 & URL, Base64url, Base32, Crockford, LEB128, ASCII85, Z85, Base58, base-36, bencode, Morse, quoted-printable, URI, Punycode/IDN, Unicode escapes, data URLs, MIME, hex, HTML entities, JWT, JSON helpers, crypto.