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2-61.

Write the equation for the following tile pattern.

tile

tile

tile

tile

tile

tile

tile

Figure 2

tile

tile

tile

tile

tile

tile

tile

tile

tile

Figure 3

tile

tile

tile

tile

tile

tile

tile

tile

tile

tile

tile

Figure 4

Make a table of data, relating the figure number (as ), and the number of squares .