Suppose that circles of equal diameter are packed tightly in $n$ rows inside an equilateral triangle. If $A$ is the area of the triangle and $B$ is the total area occupied by the $n$ rows of circles, then find the limit of the ratio $\frac{B}{A}$ (correct to 3 decimal places) as the value of $n$ approaches infinity.

**The above figure shows the case for $n = 4$**

**Courtesy : Stewart Calculus Early Transcendentals Sixth Edition **

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