1.

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

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


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