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?

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) =

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

     =

   ∴ favorable=

 And , Total =

Probability that the child will have no trace of the disease=

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dont think so

step-by-step explanation: