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- fib_seq = [1, 2]
- answer = 0
- while fib_seq.last < 4_000_000 do
- fib_seq = fib_seq.last(2).inject { |a, b| fib_seq << a + b }
- end
- fib_seq.each { |x| answer += x if x.even? }
- puts answer
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