1.

In a survey of 300 android mobile users, who make video calls, 75 people said they use viber, 45 use skype and 90 people use both. The number of persons who use neither viber nor skype is __.

Answer»

In a survey of 300 android mobile users, who make video calls, 75 people said they use viber, 45 use skype and 90 people use both. The number of persons who use neither viber nor skype is __.



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