Two matrices $A$ and $B$ are added if

both are rectangular

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both have same order

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no of columns of A is equal to columns of B

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no of rows of A is equal to no of columns of B

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Solution

The correct option is C both have same order
While adding two matrices we add the numbers which belong to some row and column of each matrix or two matrices can be added if there are equal number of rows and columns in both.
Hence, both matrices should have same order.
$∴$ option B is correct

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Two matrices A and B are added if

The correct option is C both have same orderWhile adding two matrices we add the numbers which belong to some row and column of each matrix or two matrices can be added if there are equal number of rows and columns in both.Hence, both matrices should have same order.∴ option B is correct

Two matrices $A$ and $B$ are added if

The correct option is C both have same order
While adding two matrices we add the numbers which belong to some row and column of each matrix or two matrices can be added if there are equal number of rows and columns in both.
Hence, both matrices should have same order.
$∴$ option B is correct