| Hellin's l. |
one in about 89 pregnancies results in the birth of twins; one in 89 × 89, or 7921, of triplets; one in 89 × 89 × 89, or 704,969, of quadruplets.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| Hellin's law |
see under law.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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