The side of a triangle are in AP and its are is \( \frac{3}{5} \times( \) area of an equilateral...

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The side of a triangle are in AP and its are is \( \frac{3}{5} \times( \) area of an equilateral triangle of the same perimeter). Then the ratio of the sides of
(a) \( 1: 2: 3 \)
(b) \( 3: 5: 7 \)
(c) \( 3: 4 \)
(d) none of these
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