Bible有道数学题没看懂~~求助！！

宝爱一

1. What is the maximum number of 3x3 squares
that can be formed from the squares in the
6x6 checker board to the right?
(A) 4
(B) 6
(C) 12
(D) 16
(E) 24
然后还给了个图。。。无语。。。到底让我求什么？

宝爱一

Clearly, there are more than four 3x3 squares in the checker board—eliminate (A). Next, eliminate (B)
since it merely repeats a number from the problem. Further, eliminate (E) since it is the greatest. This
leaves choices (C) and (D). If you count carefully, you will find sixteen 3x3 squares in the checker board.
The answer is (D).
这是给的解释。。。同样也没看懂。。。~~~~(>_<)~~~~ 救命啊。。。