Fill in the missing number:
0 3 3 12 27 75 192 __
 Add that number to _____. Go to that room.
Answer: 507 (plus number in ). Notice that the sequence follows the Fibonacci sequence, then squares each term and multiplies it by three.
Davidson is having a round-robin tennis tournament. Five players are signed up to participate, and in this type of contest, each pair of the five contestants must play each other. If the tournament is scheduled so that no contestant plays more than one match each day, what is the minimum number of days over which the tournament can be held?
The minimum number of days for the tournament is 5:
A total of ten matches must be played, and since no one player can compete twice in one day, only two matches (four players) can be scheduled for each day.