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How many different signals cab be given using any number of flags from 5 flags of different colours?

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The required number of signals is:--
`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`
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