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GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help Prelude> fact x = if x == 1 then 1 else x * (fact (x-1)) Prelude> (fact 100) - (fact 50) 93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976126104193051984542783611150085120442072486358431039488000000000000 Prelude> (fact 101) - (fact 51) 9425947759838359420851623124482936749562312794702543768327889353416977599316221476503087861590257228158336107723325356566900403091540004279983013888000000000000 Prelude> ((fact 101) - (fact 51)) / ((fact 100) - (fact 50)) 100.99999999999999