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Given 5 flags of different colours, how ...

Given 5 flags of different colours, how many different signals can be generated if each signal requires the use of 2 flags, one below the other?

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The correct Answer is:
Hence, total number of different signals that can be generated=`5 xx 4` = 20.
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OMEGA PUBLICATION-PERMUTATIONS AND COMBINATIONS-Multiple Choice Questions (MCQs)
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