Five different colored flags can be hung in a row to make a coded signal. How many signals can be made if a signal consists of the display of one or more flags? A. 11 B. 13 C. 15 D. 17

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We can apply binary system for calculations.

Let 1-is flag, 0- no flag.

The we can represent coded signal with binary numbers:

from 00001 to 11111

Answer: C.

$N=2^4-1=15$

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Question ID: mtid-5-stid-8-sqid-3453-qpid-2152