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RosettaCodeData/Task/Fibonacci-sequence/Smalltalk/fibonacci-sequence-4.st

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Integer >> fibBinetFloatE
|phi rPhi|
phi := FloatE phi.
rPhi := 1 / phi.
^ (1 / 5 sqrt) * ((phi raisedTo:self) - (rPhi raisedTo:self))
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