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The first, third and fifth positions can be filled by 3 * 2 * 1 by A, B and C
The second, fourth and sixth positions can be filled by different ads of X by 3 * 2 * 1


Below is the way to fill six spots,

3 * 3 * 2 * 2 * 1 * 1

36

Answer D.
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Company X advertisement can be filled in 2,4,6 spots= 3! ways= 3*2*1= 6 ways
Advertisement of A,B,C can be filled in 1,3,5 spots=3! ways= 6 ways

Total ways= 6*6= 36 ways

Answer:D

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