Class: Fortune::A

Inherits:

P_abstract

• Object
• P_abstract
• Fortune::A

Defined in:

lib/fortune/a.rb

Overview

Permutation without repetition with select k elements (accommodation) example: 20 different elements and you need select 5 of them (how many ways of selection exists?)

elements is ordered ([a,b,c] != [b,c,a])
A.calc(:elements => 10, :select => 5)

Instance Attribute Summary

Attributes inherited from P_abstract

#k, #n, #value

Instance Method Summary

• #initialize(h) ⇒ A constructor

  A new instance of A.

Methods inherited from P_abstract

calc

Constructor Details

#initialize(h) ⇒ A

Returns a new instance of A.

# File 'lib/fortune/a.rb', line 8

def initialize(h)
  super(h)
  self.value = Math.factorial(self.n)/Math.factorial(self.n - self.k)
end