The figure shows a grid formed by a collection of the unit squares. T...
Given : The figure shows a grid formed by a collection of the unit square. The unshaded unit square in the grid represents a hole.
The maximum number of square without a “hole in the interior” that can be formed within the 4 x 4 grid can be counted as.
(ABIJ, BCHI, CDGH, DEFG, FONG, HMLI, ILKJ, KLST, LMRS, MNQR, NOPQ, PUVQ, QVWR,
RWSX, SXYT, ACMK, JHRT, KMWY, LNVX, MOUW)
Total number of squares are 20.
Hence, the correct option is (D).