1.

Group the following into three classes on the basis of their identical properties.

A.  1, 3, 8; 7, 4, 2; 6, 5, 9
B.  1, 9, 7; 3, 6, 8; 2, 3, 4
C.  1, 4, 8; 6, 3, 2; 7, 5, 9
D.  4, 7, 9; 3, 6, 5; 2, 8, 1
Answer» B.  1, 9, 7; 3, 6, 8; 2, 3, 4


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