Gynaecology & Obstetrics General fea2bb13 According to Hellin's law chances of twins in pregnancy are: A 1 in 60 B 1 in 70 C 1 in 80 D 1 in 90 High-Yield Explanation According to Hellin’s rule The mathematical frequency of multiple pregnancy is: Twins 1 in 80 Triplets 1 in (80)2 Quadruplets 1 in (80)3 and so on