Question 393079
In a die, no. of even number = 3 (i.e 2,4,6),

 no. of prime number = 3  (i.e 2,3,5)

 no. of prime which is also even = 1   (i.e 2)

P(A U B) = P(A) + P(B) -P(A /\ B)       /\ -intersection sign 



Probability (even or prime) =  3/6 +3/6 -1/6 = 5/6



no. of faces greater than or equal to 5 = 2          ( i.e 5,6)

 
Probability ( at least 5) = 2/6