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Q.

One side of an equilateral triangle is 24 cm. The mid points of the sides are joined to form another triangle whose midpoints are joined to form still another triangle. This process continues infinitely many times, then the sum of the perimeter of all the triangles

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a

12

b

13

c

169

d

144

answer is D.

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Detailed Solution

72+36+18+…∞

S∞=721−1/2=144cms

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