Bolls are arranged in row to form an equilateral triangle . First row contain 1 ball , second row contain 2 ball and so on... If 669 more balls are added then, they arrange in the shape of square and each of its side then contain 8 balls less than each side of triangle find the initial numbers of balls.
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refer to the picture
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aasthajain1:
thankxx a lot yrr :-)
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Here is your answer...................
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