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December 16, 2015 22:20
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This method counts all the numbers that are multiples of the numbers you give.
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# If we list all the natural numbers below 10 that are multiples of 3 or 5, | |
# we get 3, 5, 6 and 9. The sum of these multiples is 23. | |
# Find the sum of all the multiples of 3 or 5 below 1000. | |
def multiples(number, *multipliers) | |
count = 0 | |
list = [] | |
# This range excludes the number you give | |
# Natural numbers starts at 1 | |
(1...number).each do |num| | |
multipliers.each do |mult| | |
next unless num % mult == 0 | |
unless list.include?(num) | |
count += num | |
list << num | |
end | |
end | |
end | |
count | |
end |
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