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A survey of 500 television viewers produced the following information; 285 watch football, 195 watch hockey, 115 watch basketball, 45 watch football and basketball, 70 watch foot ball and hockey, 50 watch hockey and basket ball, 50 do not watch any of the three games. Find the number of viewers watch all the three games.

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answered Jun 24, 2014 by thanvigandhi_1

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