Hi, your logic is correct but 'nchoosek' hogs memory space. there is a better way...
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Is A the inverse of B?
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Easy Sequences 32: Almost Pythagorean Triples
Easy Sequences 9: Faithful Pairs
Easy Sequences 33: Web Trapped Ant
Easy Sequences 15: Pythagorean Area with maximum Hypotenuse
Easy Sequences 5: Project Euler Problem 1 - Again!
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