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Tamil Nadu Public Service Commission (TNPSC) Village Administrative Officer (VAO) Question Paper 2007. 1. If a:b = 5:9 and b:c=4:7. find a:b:c. A) 5:9:7 B) 20:36:63 C) 10:18: 14 D) 20:81 :63. 2. The perpendicular drawn from the centre of a circle divides the chord into ………… equal parts. A) 2 B) 3 C) 4 [...]