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Out of 100 families in the neighbourhood, 50 have radios, 75 have TVs and 25 have VCRs. Only 10 families have all three and each VCR owner also has a TV. If some families have radio only, how many have only TV?
It is given that 25 families have VCRs and each VCR owner also has a TV
=> TV owners who do not have VCR = 75 - 25 = 50
Also, 10 families have all three items
=> No. of families having only TV = 50 - 10 = 40
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