SOLUTION: how many signals can be given with three different flags when any number of them may be used?

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Question 975951: how many signals can be given with three different flags when any number of them may be used?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
3 one flag messages (1) (2) (3)
3 two flag messages (1,2) (1,3) (2,3)
1 three flag message (1,2,3)
So 7 in total.