006.rb

=begin
The sum of the squares of the first ten natural numbers is,

12 + 22 + ... + 102 = 385
The square of the sum of the first ten natural numbers is,

(1 + 2 + ... + 10)2 = 552 = 3025
Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025  385 = 2640.

Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
=end

sum_squares = (1..100).inject(0) { |result, element| result = result + element * element}

square_sum = (1..100).inject(0) { |result, element| result = result + element}
square_sum *= square_sum

puts sum_squares - square_sum