1.A survey of 500 television viewers produced the given information;285 watch football;195 watch hockey;115 watch cricket;70 watch football and hockey;45 watch football and cricket ;50 do not watch any of three games.How many watch exactly one of the three games ?
if your query is:
A survey of 500 television viewers produced the given information;285 watch football;195 watch hockey;115 watch cricket;70 watch football and hockey;45 watch football and cricket ;50 watch cricket and hockey;50 do not watch any of three games.How many watch exactly one of the three games.
Let A, B and C represents the number of viewers, who watched football , hockey and cricket respectively.
therefore
[since 50 do not watch any of the three games ]
those who watch all the three games
the number of viewers who watched only football
the number of viewers who watched only hockey
the number of viewers who watched only cricket
therefore the number of viewers who watched exactly one game
=190+95+40
=325
hope this helps you.
cheers!!