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Permutations & Combinations
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A new flag is to be designed with six vertical stripes using some or all of the colors yellow, green, blue and red. Then, the number of ways this can be done such that no two adjacent stripes have the same color is ?
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6p4 is the answer for above question..it can be arranged in 6p4 ways
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No.of ways of selectimg a colour for 1st stripe =4
For 2nd stripe =3(as the colour of 1st stripe must not be selectes)
Similarly for 3,4,5,6 stripes there are 3*3*3*3 ways
Total=4*3*3*3*3*3 ways