1.

                            Group the given figures into three classes using each figure only once. (SOF IMO 2016)

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


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