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The first figure takes matchstick squares to build the second takes 9 to build and the third takes 13 to build, as can be see
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second figure takes a matchstick squares Third figure takes 13 Matchstick squares. from the formula of Arithmetic Preogressio(b) for - with faguare a = 5 d = 4 .. th figuare will take match stick squares to build = 5 + (n-1) 4 - 5+ 40-4 = 40 + 1 Anthfor nth figuare, it will take match sticks - 16+ (n-1) 12 = 16+ 120 - 12 - 12n +4 .. (C) The nth figure will take 112n + 4 Ma

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