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Which of these boards can be covered exactly by $2 \times 1$ tiles?

Class 7Tiling PatternsGeometry

A $1 \times 9$
B $3 \times 6$
C $3 \times 5$
D $5 \times 7$

Step-by-Step Solution

3 \times 6 = 18

squares (even) and each row of 6 can be filled by 3 tiles laid end to end. The others have 15, 35 and 9 squares, all odd.

Answer: B)

3 \times 6

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