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Least number of unit squares to draw to get a picture.

Source: ToT 2003 SO-2

June 26, 2011
inductioncombinatorics unsolvedcombinatorics

Problem Statement

What least possible number of unit squares (1×1)(1\times1) must be drawn in order to get a picture of 25×2525 \times 25-square divided into 625625 of unit squares?
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