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What is the definition of natural number ?
In ΔABC line PQ is drawn parallel to side BC where P and Q are respectively lie on side AB and AC. If AB = 3AP, what is the ratio of area of ΔAPQ to area of ΔABC (a) 1 : 3 (b) 1 : 5 (c) 1 : 7 (d) 1 : 9