Class: Fortune::C

Inherits:

P_abstract

• Object
• P_abstract
• Fortune::C

Defined in:

lib/fortune/c.rb

Overview

Combinations without repetition example: 10 different elements (students) and you need select 5 of them (how many ways of selection exists?)

elements does not ordered ([a,b,c] == [b,c,a])
C.calc(:elements => 10, :select => 5)

Instance Attribute Summary

Attributes inherited from P_abstract

#k, #n, #value

Instance Method Summary

• #initialize(h) ⇒ C constructor

  A new instance of C.

Methods inherited from P_abstract

calc

Constructor Details

#initialize(h) ⇒ C

Returns a new instance of C.

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

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