Permutation Problem

Solution: How many signals can be made if a signal consists of the display of one or more flags?

How many signals can be made if a signal consists of the display of one or more flags?

Problem Statement: EE Board October 1997

Four different coloured flags can be hung in a row to make coded signal. How many signals can be made if a signal consists of the display of one or more flags?

Problem Answer:

There are 64 signals that can be made

Solution:

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