Question

Mrs. R is pregnant and very worried that the child will have beta-thalassemia. What is the probability that the child will have beta-thalassemia major? What is the probability that the child will have no trace of the disease?

Answer 1

Answer:

There are three kind of beta-thalassemia.

Total possible outcome=  3 types of beta- thalassemia + 1 [child will have no trace of disease] = 4

As we know Probability(outcome) = $\frac{\text{ Total favorable outcome}}\text{Total possible outcome}$

Probability that the child will have beta-thalassemia major =\frac{_{1}^{3}\textrm{C}}{_{1}^{4}\textrm{C}}

     =$\frac{3}{4}$

   ∴ favorable=$_{1}^{3}\textrm{C}$

 And , Total =$_{1}^{4}\textrm{C}$

Probability that the child will have no trace of the disease=$\frac{1}{4}$