Question
Given 5 flags of different colours, how many different signals can be generated if each signal requires use of 2 flags, one below the other?
Solution
Number of ways of finding a flag for place 1 = 5
m = 5Number of remaining flags = 4
Number of ways of finding a flag for place 2 to complete the signal = 4
n = 4
∴ By fundamental principle of counting, the number of signals generated
=
n = 4∴ By fundamental principle of counting, the number of signals generated
=
