Last Problem:
Is it cheaper to take one friend to the
movies twice, or two friends at the same time?
Answer
Taking two friends at the same time is cheaper.
You pay for your ticket plus 2 others this way
for a total of three tickets. If you go to the
movies twice with a friend, you pay for 2 tickets
each time, one for yourself and the other for
your friend, making a total of four tickets.
Today’s Problem:
The letters O, T, T, F, F, _, _ are part of an
intelligible series. Add two more letters in
the blanks.
After you do this, explain how the series can
be expanded indefinitely.