Gynaecology & Obstetrics The risk of mongolism in a mother at the age 20 years is 1 : 000. what should be ratio when she is 45 yeas old : A 4.208333333 B 2.125 C 0.763888889 D None 💡 Explanation The risk of mongolism in a mother at the age 20 years is 1 : 000. what should be ratio when she is 45 yeas old : ✓ Correct Answer: D. None