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Numerical Reasoning - Number Matrices

The numbers in the grid go together in a certain way.  Which number should be in the square marked by the question mark?

       ?  8  9 

      10 11 12 

      13 14 15

A: 6

B: 7

C: 8

D: 9

E: none of these


The numbers in the grid go together in a certain way.  Which number should be in the square marked by the question mark?

       9  8  7 

       6  ?  4 

       3  2  1

A: 6

B: 5

C: 4

D: 3

E: none of these


The numbers in the grid go together in a certain way.  Which number should be in the square marked by the question mark?

       2  4  6 

       ? 10 12 

      14 16 18

A: 7

B: 8

C: 9

D: 10

E: none of these


The numbers in the grid go together in a certain way.  Which number should be in the square marked by the question mark?

       3  6  9 

       6  ? 12 

       9 12 15

A: 6

B: 7

C: 8

D: 9

E: none of these



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