TV Channel Survey

A survey was taken among 100 people to find their preference of watching T. V. programs. There are 3 channels. Given the number of people who watch
· At least channel 1
· At least channel 2
· At least channel 3
· No channels at all
· At least channels 1and 3
· At least channels 1 and 2
· At least channels 2 and 3
Find the number of people who watched all three.

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