Question

Ten cards numbered 1 to 10 are placed in a box, mixed up throughly and then one card is drawn randomly. If it is known that the number on the drawn card is more than 3, what is the probability that it is an even number?

Answer 1

Let A : Even number on card drawn and B : Number is greater than 3 

We have to determine P(A/B) space 

sample S = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} 

Then A = {, 4, 6, 8, 10}, 

B = {4, 5, 6, 7, 8, 9, 10} 

and A ∩ B = {4, 6, 8, 10}