[issue39648] Update math.gcd() to accept "n" arguments.

[Dennis Sweeney]

Dennis Sweeney <sweeney.dennis650 at gmail.com> added the comment:

Correction: gcd(itertools.chain(iterables)) == gcd(*map(gcd, iterables))

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39648>
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