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Aditi Agrawal posted an Question

June 01, 2020 • 23:07 pm

30 points

IIT JAM
Physics (PH)

Please explain this concept

3 Answer(s)

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Ruby negi

n(n+1)/2 are the no of distinct elements in the symmteric matrix as you know aij=aji(ex: a12=a21) .... hope you get to know ...
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so (n^2-n)/2 no of elements are repeat itself. so distinct elements are n(diagonal elements)+(n^2-n)/2....
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Ruby negi Best Answer

go through this...
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Nice explaintion!
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Dhairya sharma

dear u have to memorise properties of matrix to solve the questions. these are thumb rules of matrix algebra
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Dhairya sharma

if we have n×n matrix..... dear then u can try that we always have n(n+1)/2 no of elements. bcoz off digonal have same no of elements so we divide it by 2
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Dhairya sharma

if we have n×n matrix we would have n diagonal elements due to n raws
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for what it is used
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dear these are question which are directly asked in exams like tell the no of symmetric companants n all
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it's from the definition of matrix algebra.
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ok
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dear u have to memorise properties of matrix to solve the questions. these are thumb rules of matrix algebra
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ok thank you very much
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Dhairya sharma

dear this is the property which we proved.....u have to memorise it
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