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-1 byte thanks to @xnor!
(!)=(sum.)b=sum.zipWith(*)b a#b=a!b/b!b
Try it online!Try it online!
(a,b)->p(a,b)/p(b,b) p=sum..map$(*)
Try it online!
(!)=(sum.).zipWith(*) a#b=a!b/b!b
(!)b=sum.zipWith(*)b a#b=a!b/b!b
