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If n=3,then I=m[(a/2)2+(b/2)2](1/3)=m(a2+b2)/12 where a,b are length and breadth.Hence,it is correct.
If n=4,then I=m[a2+b2](1/4) where a,b are semi-major and semi-minor axes.Hence,It is also correct.
For n=5,the ans given by prathab is right.So,all are correct.
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