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CAT-2004-Previous Years Paper

Question
35 out of 35
 

A new flag is to be designed with six vertical stripes using some or all of the colours yellow, green, blue and red. Then, the number of ways this can be done so that no two adjacent stripes have the same colour, is



A 12 × 81
B 16 × 192

C 20 × 125
D 24 × 216

Ans. A

The first strip can be of any of the four colours. The 2nd can be of any colour except that of the first (i.e., 3). Similarly, each subsequent strip can be of any colour except that of the preceding strip (= 3)

Hence, the number of ways = 4 × 35 = 12 × 81

CAT-2004-Previous Years Paper Flashcard List

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