For finite difference analysis, a rectangular plate measuring 10 by 20 cm is divided into eight subregions

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For finite difference analysis, a rectangular plate measuring 10 by 20 cm is divided into eight subregions by lines 5 cm apart parallel to the edges of the plates. How many free nodes are there if the edges are connected to some source? 

(a) 15
(b) 12

(c) 9

(d) 6

(e) 3

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