Question 404542

P(A U B) = P(A) + P(B) - P(A n B) 

using this formula...

=> 0.9 = 0.7 + 0.5 - P(A n B) 

=> P(A n B) = 1.2 - 0.9 = 0.3 


SO, P( A AND B) = 0.3