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# How many different signals can be transmitted by hoisting 3

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Senior Manager
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How many different signals can be transmitted by hoisting 3 [#permalink]  30 Jan 2004, 17:20
How many different signals can be transmitted by hoisting 3 red, 4 yellow and 2 blue flags on a pole, assuming that in transmitting a signal all nine flags are to be used?
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P(9; 3, 4, 2) = 9!/(3! 4! 2!) = 1260
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Zhung Gazi didn't get ur explanation....could you be a bit more elaborate.

Vivek.
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The #permutations of n things taken all together, when p of the things alike of one kind, q of them alike of another kind, r of them alike of a third kind and the remaining all different = n! / (p! q! r!)
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