GATE CS 2026 Set 2 — Question 7
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General Aptitude → Spatial Aptitude → 2D & 3D Patterns
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Question
Two tiles are missing in Panel I. Which one of the options in Panel II is the appropriate choice for the missing tiles?
Correct answer
(A) (i)
Solution
Count the black (filled) dots in each tile of Panel I (white dots are just the empty positions):
The counts used so far are 8, 1, 6, 3, 5, 4, 9 — every number from 1 to 9 except 2 and 7. The grid is the classic magic square: every row, column and diagonal must sum to 15.
| Column 1 | Column 2 | Column 3 | |
|---|---|---|---|
| Row 1 | 8 | 1 | 6 |
| Row 2 | 3 | 5 | ? |
| Row 3 | 4 | 9 | ? |
- Row 2: (top missing tile).
- Row 3: (bottom missing tile).
- Check column 3: , and the diagonals , .
- (i): 7 / 2 — matches.
- (ii): 6 / 2 — top tile wrong.
- (iii): 7 / 3 — bottom tile wrong.
- (iv): 6 / 4 — both wrong.
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