Created
June 12, 2019 10:11
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| {-- | |
| By considering the terms in the Fibonacci sequence whose values do not exceed four million, | |
| find the sum of the even-valued terms. | |
| --} | |
| let fib = 1 : 2 : zipWith (+) fib (tail fib) | |
| foldr (+) 0 $ filter even $ takeWhile (< 4e6) fib |
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