A survey of 527 adults aged 18-24 year olds was conducted in which they were asked what they did last Friday night. It found: 173 watched TV 177 hung out with friends 187 ate pizza 37 watched TV and ate pizza, but did not hang out with friends 39 watched TV and hung out with friends, but did not eat pizza 36 hung out with friends and ate pizza, but did not watch TV 36 watched TV, hung out with friends, and ate pizza How may 18-24 year olds did not do any of these three activities last Friday night?