Of the 500 business people surveyed, 78 percent said that they use their laptop computers at home, 65 percent said that they use them in hotels, and 52 percent said that they use them both at home and in hotels. How many of the business people surveyed said that they do not use their laptop computers either at home or in hotels?
Can somebody give the formula for this overlapping set problem?
P(AUB) = P(A)+P(B)-P(A intersection B)
I tried to use the domain matrix learnt from MGMAT. But somewhere I am going wrong, can someone help?
I guess you made a mathematical error. Personally, I prefer creating the matrix in percentages when the question is given in percentages. And finally multiply what I want with the total. However for illustration the matrix should be