Question 10
The Counting Principle
A signal can be sent from one location to another by running different colored flags up a flagpole, one
above the other. There are 15 different colored flags to choose from but only 7 flags will be flown. Find the
number of different signals consisting of 7, if the first flag must be white.
If the first flag is white then the number of different signals consisting of 7 flags is