Q6 please solve it ??!!!??

Dear Student,
Solution) 6) Given, Product A liked by consumer = 800
                                                                         n(A) = 800
                               Product B liked by consumer = 550
                                                                           n(B) = 550
                                    Total number of consumer = 1200 
                                                                     n(A∪ B) = 1200
Least number must have like both n(A ∩ B) = ?
As, we know that,
​ n(A ∪ B ) = ​n(A) + ​n(B) - ​n(A ∩ B)
After substituting all values, we get,
1200 = 800 + 550 - ​n(A ∩ B)
​n(A ∩ B) = 1350- 1200 = 150
Regards!