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How many signals can be given by 5 flags of different colours using 3 flags at a time.

How many signals can be given by 5 flags of different colours using 3 flags at a time. Correct Answer 60

Possible ways = 5P3 = 5 × 4 × 3 = 60 [Ways of choosing 3 flags from 5 flags is 5C3. But different signals can be given bay rearranging those 3 flags in 3! ways. So, total possible ways of giving signal =  5C3× 3! =  5P3]  

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