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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

1. $12 \times 81$
2. $16 \times 192$
3. $20 \times 125$
4. $24 \times 216$

ans is a

as 4*3*3*3*3*3

as no two adjacent strip can be of same color
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