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20 Emily wants to insert nine numbers into the 3 x 3 table so that the sum of the numbers in two adjacent cells (with a common side) is always the same. She has already written two numbers into the table. How big is the sum of all nine numbers? 8 (0) (D) 22 (B) 20 (C) 21 (0) 19 (E) 23
Sagot :
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