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How many different signals can be genera...

How many different signals can be generated from 6 flags of different colours if each signal makes use of all the flags at a time, placed one below the other?

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The correct Answer is:
6! = 720
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NEW JOYTHI PUBLICATION-PERMUTATIONS AND COMBINATIONS-QUESTIONS FROM COMPETITIVE EXAMS
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  15. If ""^(n)C(3)=220, then n = ?

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  19. Rank of the word " MOTHER " is

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