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If Arun secures 70 marks in eng,we may express this as [70] or (70) which means that the no. inside[ ] or( ) is the marks obtained by Arum in eng.

Likewise if he secue 70 marks in eng,85 in maths and 80 in statics we may express this as:[70 85 80].

Definition---A matrix is a rectangular array of nos. enclosed by a pair of brackets

[ ] or ( ) subject to certain rules of operation.A set of mn no.a₁₁,a₁₂,.....,amn arranged in a rectangular array of m rows and n columns like

[a₁₁ a₁₂ a₁₃.................a₁n]

[a₂₁ a₂₂ a₂₃.................a₂n]

[........................................]

[am₁ am₂ am₃............amn]..........should be in one third bracket