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It is possible to arrange eight of the n...

It is possible to arrange eight of the nine numbers 2, 3, 4, 5, 7, 10, 11, 12, 13 in the vacant squares of the 3 by 4 array shown below so that the arithmetic average of the numbers in each row and column is the same integer.

Which one of the nine numbers must be left out when completing the array ?

A

A) 4

B

B) 5

C

C) 7

D

D) 10

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The correct Answer is:
D
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