SOLUTION: Four different colored 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?
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Question 1093146: Four different colored 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? Answer by ikleyn(52776) (Show Source):
4 signals if to use 1 flag only, plus
4*3 = 12 signals if to use 2 flags only, plus
4*3*2 = 24 signals if to use 3 flags only, plus
4*3*2*1 = 24 signals if to use all 4 flags.
In all, 4 + 12 + 24 + 24 = 64 signals.
Answer. 64 signals.
