31) Observe the following pattern of triangles made of match sticks AYNAW 9 Number of triangles 1 2 3 4 Number of matchsticks 3 6 7 9 How many match-sticks do you think are required to make 10 triangles? (A) 16 (B) 19 (C) 21 (D) 25
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A. is the correct answer.
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