Mining Engineering > GATE 2022 > Aptitude
The figure shows a grid formed by a collection of unit squares. The unshaded unit square in the grid represents a hole.
What is the maximum number of squares without a "hole in the interior" that can be formed within the 4x4 grid using the unit squares as building blocks?
A
15
B
20
C
21
D
26

Correct : b

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