89
This number is a prime.
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Hellin's law states that twins occur once in 89 births, triplets once in 892 births, and quadruplets once in 893 births, and so forth. This approximation came before the advent of fertility methods. [Crown]
Submitted: 1999-09-02 23:40:00; Last Modified: 2008-06-09 16:31:02.
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