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# Which number should be added to 6412 to make ot aperfect sqare

Which number should be added to 6412 to make ot aperfect sqare

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6400=64×100=8^2×10^2=80^2

81^2=(80+1)^2=80^2+2×80+1

=6400+161=6561

6561–6412=149

149 is to be added