1.

What is the probability of occurrence of a number greater than 2, if it is known that only even number can occur ?

Answer»

S = {1,2,3,4,5,6}

Let A = event of even number on dice

= {2,4,6}

and B = even number greater than 2

= {4,6}

A ∩ B = {4,6}

Similarly, n(A ∩ B) = 2

n(s) = n(A) = 3

∴ P(B/A) = n(A ∩ B)/n(A) = 2/3


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