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Class 12 Tuition > Learn Class XI-XII Tuition (PUC) > Given 5 flags of different colours, how many different...
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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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5C2 *2! = 20 Out of 5 flags choosing any two will give you a signal. Now these flags can be interchanged (suppose red on top and blue below it, now blue on top and red below it) Hence 2! for this arrangement among these two colours themselves.
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