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Square matrix [a(ij)](ntimesm) will be a...

Square matrix `[a_(ij)]_(ntimesm)` will be an upper triangular matrix, if

A

`a_(ij)=0`, for `iltj`

B

`a_(ij)=0`, for `igtj`

C

`a_(ij)=!0`, for `iltj`

D

`a_(ij)=!0`, for `igtj`

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The correct Answer is:
B
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