Question

In a survey of T.V programme watched by 115students ,it was found that 65 are watching discovery channel,50 are watching geographical channel,55 are watching sports channel,28 are watching discovery channel and geographical channel,35 are watching discovery channel and sports channel,30are watching geographical channel and sports channel and 25 did not watch any of these three channels. Find how many were watching (i)Only discovery channel and (ii) Exactly two channels.​

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