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havenwood/gist:5605341

Forked from anonymous/gist:5605311
Last active December 17, 2015 11:49
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gistfile1.rb
def fib n
a, b = 1, 2
sum = 0
while a < n
sum += a if a.even?
a, b = b, a + b
end
sum
end
fib 4_000_000
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