math_celebrity Administrator Staff member Jul 31, 2020 #1 In a survey of 420 people, 230 use samsung mobile, 180 use iphone, 90 use both ,find the number of people who don't use either of them People who don't use both is: 420 - (230 + 180 - 90) 420 - (320) 100

In a survey of 420 people, 230 use samsung mobile, 180 use iphone, 90 use both ,find the number of people who don't use either of them People who don't use both is: 420 - (230 + 180 - 90) 420 - (320) 100