select a circle

Question

select a circle . these are in circles...1,2,3,4,5,6

 

Assume that one circle is selected at random and each circle is equally likely to be selected. Determine the probability of selecting.

 

a number less than 2, given that the number is less than 5.

Answer 1

Let A be the event a circle less than 2; B be the event a circle less than 5.

 

Use the formula:  P(A|B) = P(AB) / P(B)