Permutation & Combination Calculator API - Ruby Gem

Calculate permutations (P(n,r)) and combinations (C(n,r)) for any given values of n and r.

Installation

Add this line to your application's Gemfile:

gem 'apiverve_permutationcombination'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install apiverve_permutationcombination

Getting Started

Get your API key at APIVerve

Basic Usage

require 'apiverve_permutationcombination'

# Initialize the client
client = APIVerve::Permutationcombination::Client.new(api_key: "YOUR_API_KEY")

# Make a request
response = client.execute({
  n: 10,
  r: 3
})

# Print the response
puts response

Error Handling

begin
  response = client.execute({ n: 10, r: 3 })
  puts response["data"]
rescue APIVerve::Permutationcombination::ValidationError => e
  puts "Validation error: #{e.errors.join(', ')}"
rescue APIVerve::Permutationcombination::APIError => e
  puts "API error: #{e.message}"
  puts "Status code: #{e.status_code}"
end

Debug Mode

# Enable debug logging
client = APIVerve::Permutationcombination::Client.new(
  api_key: "YOUR_API_KEY",
  debug: true
)

Example Response

{
  "status": "ok",
  "error": null,
  "data": {
    "n": 10,
    "r": 3,
    "permutation": 720,
    "combination": 120,
    "formulas": {
      "permutation": "P(n,r) = n! / (n-r)!",
      "combination": "C(n,r) = n! / (r! × (n-r)!)"
    }
  }
}

Documentation

For more information, visit the API Documentation.

Support

License

This gem is available under the MIT License.