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(a) In figure 4, number of lines = 17 + 5 =22

(b) Number of squares in figure 36 = 36 * 2 = 72

(c) Number of line on figure u = 7 + 5( u -1) 

7 + 5(u -1 ) = 62

5 ( u – 1) = 55

u -1 = 11

u = 12

Figure 12  is drawn with  62 lines.

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