There are three different cable channels namely NCC,CBB and NTK.In arecent survey of 560 viewers,it was found that 476 viewers responded to NTK,112 viewers to CBB and 168 viewers to NCC.112 viewers respond to exactly two channels and 28 to none.
i- Determine the number who responded to all the three cables
ii- Assuming 112 viewers respond to NCC and NTK, and 90 viewers respond to NTK and CBB, what is the number of viewers who watch only CBB?
I tried as follows:
i- Those who responded to all the three cables were 560-28 =532
ii- Please help in this answer.