Project Euler

Problem: Sum Square Difference

• The sum of the squares of the first ten natural numbers is, 1^2 + 2^2 + ... + 10^2 = 385
• The square of the sum of the first ten natural numbers is, (1 + 2 + ... + 10)^2 = 55^2 = 3025
• Hence the difference between the square of the sum and the sum of the squares is 3025 − 385 = 2640. Find the difference between the square of the sum of the first one hundred natural numbers and the sum of the squares.

Instructions

• Code your procedural solution into the lib/sum_square_difference.rb file.
• Code your object-oriented solution into the lib/oo_sum_square_difference.rb file.
• Run learn until you get all of the RSpec tests to pass.

Source

• Project Euler - Problem 6

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