প্রশ্ন ও সমাধান

There are five people - Sarah, Bill, Eric, Molly, Nick - scheduled for appointments at a doctor's office on a specific morning, plus a walk-in, Katie. There are five appointment slots: 9:30, 10:00, 11:00, and 11:30. The following conditions apply.Katie will only get a slot if one of the five people with an appointment does not show up.Sarah is not scheduled for 10:00 or 11:00.Eric is scheduled for 11:30.Molly's appointment is immediately before Nick's.Which one of the following is a possible sequence of the 5 people's appointments?