A is a triangular number as well as a perfect square and B is also a triangular number such that A + B = 81. tue value of ( B - A ) is
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A + B = 81
A= triangle and square. square has all side same
[triangle=90°]
30 ans
81 -30= 51
[b -a] = 51 - 30
= 21 ANS
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