Correct Answer: 1, 4, 7; 2, 6, 8; 3, 5, 9
Explanation:
As per the given series of figures, which can be classified as:-
Figures (1), (4) and (7) → Each figure is shaded.
Figures (2), (6) and (8) → Each figure is shaded with straight lines.
Figures (3), (5) and (9) → Each figure is shaded with oblique lines.
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