SOLUTION: If there are five different flags to select, how many different signals can be made by using at least 3 distinct flags?

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Question 1175301: If there are five different flags to select, how many different signals can be made by using at least 3 distinct flags?
Answer by ikleyn(52780) About Me  (Show Source):
You can put this solution on YOUR website!
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Different signals corresponds to different patterns (ordered sequences) of colored flags,

and repeating is prohibited.



"Using at least 3 distinct flags" means using 3, or 4, or 5 flags.



The number of different signals is


    5*4*3 + 5*4*3*2 + 5*4*3*2*1 = 300.      ANSWER

Solved.