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If some balls are arranged in the form of an equilateral triangle with `n` rows such that `r^(rh)` row of balls has `r` balls in it. If 99 more balls are added to existing one and the balls can now form a square with `(n-2)` balls in each row. Then the number of balls that formed the equilateral triangle.

A

`190`

B

`290`

C

`100`

D

`140`

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A
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