The figure is a 4×4 grid of unit squares with the unshaded cell representing a hole. How many squares can be formed using the unit cells without a hole in their interior?
There are 15 available unit squares. Of the nine 2×2 blocks,four contain the missing interior cell,leaving five. All four 3×3 blocks and the 4×4 block contain it. Thus the total is 15+5=**20, B**.
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