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Among 150 faculty members in an institute, 55 are connected with each other through Facebook ® and 85 are connected through WhatsApp ® . 30 faculty members do not have Facebook ® or WhatsApp ® accounts. The number of faculty members connected only through Facebook ® accounts is ______________.
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faculty members do not have facebook (or) Whats App accounts = 30

The faculty members having any account = 150 - 30 = 120

The faculty members having both the accounts = (facebook + Whats App) - 120

= (55 + 85) - 120 = 20

∴ The number of faculty members connected only through Facebook accounts = 55 - 20 = 35

answered by anonymous

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