What is the number of signals that can be sent by 6 flags of different colours taking one or more at a time?

Step-by-step solution

By alternation in the arrangement of flags the signals will charge the required number of signals aligned & =6 P ₁+6 P ₂+6 P ₃+6 P ₄+6 P ₅+6 P ₆ & =6+30+120+360+720+720 & =1956 aligned