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Bunuel

What is the maximum number of 3x3 squares that can be formed from the squares in a 6x6 checker board?

A. 4
B. 6
C. 12
D. 16
E. 24

See the attached figure.
Attachment:
1.jpg
We have to fix just one vertex, and remaining three will be get fixed accordingly.

In the attached figure, we fix the top left vertex. It can be any of the four points in horizontal, 1, 2, 3 and 4, that is all except last four as we will not be left with 3 squares on right of it otherwise.
Similarly, vertically we have A, B C and D.

SO the vertex could be any of 4*4 or 16 points: A1, A2, A3, A4, B1, B2.......D3 and D4.

D
could you elaborate a bit more on the vertex part? still unclear on the way of thinking for solving this question.
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