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tHE NO. OF DIFFERENT SIGNALS CAN BE GIVEN USING ANY NUMBER OF FLAGS FROM 4flags of different colour is?
The answer is given as 64.
Plz.explain...
signals using one flag = 4signals using two flags = (4C2)(2!) .... 4C2-for choosing 2 flags and 2! for their arrangment signals using three flags = (4C3)(3!) signals using four flags = (4C4)(4!) adding all up gives 64
In giving a signal, the order of the placement of colours is important,i.e a red and blue signal is different than the blue and red signal. Hence the order is very important.
Therefore the required no. of ways=4P1 +4P2 +4P3 +4P4 =4+12+24+24=64
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