MBA
Exam
n balls are arranged in rows to form an equilateral triangles. The first row consists of one ball, the second row two balls and so on. If one ball is added, then the resulting balls can be arranged in the form of a square, each side of it containing 4 balls less than that on a side of the triangle. Find the value of n. 1) 11 2) 15 3) 121 4) 120
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