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Sol: The correct answer is D. 90

As 2 = 6       or 2x3
      ​3 = 12     or 3x4
      ​4 = 20     ​or 4x5
      ​5 = 30     or 5x6
      6 = 42     or 6x7
      9 = 90     or 9 x10
 
As the numbers are the product of their next number.

Hence the correct answer is D. 90

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