# In a class

Let us assume U1, U2 and A be the events as follows:

U1 = choosing boy

U2 = choosing girl

A = choosing a student with IQ more than 150

From the problem:

P(A|U1) = P(Boy whose IQ is more than 150)

P(A|U2) = P(Girl whose IQ is more than 150)

Now we find

P(U1|A) = P(The choosen student whose IQ is more than 150 is a boy)

Using Baye’s theorem:

The required probabilities is .

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