If` A` and` B `are two matrices of the order` 3 xx m` and `3 xx n`, respectively and `m= n,` then order of matrix `(5A-2B)` is (a) `m xx 3` (b) `3 xx 3` (c) `m xx n` (d) `3 xx n`

Explanation

We have given: `A` and` B `are two matrices of the order` 3 xx m` and `3 xx n`

And `m= n,`

Then we have to find the order of matrix `(5A-2B)`
As order of `A` =` 3 xx m`

Then order of `5A`=`3xxm`

And order of `B`=`3xxn`

Then order of `2B`=`3xxn`

Hence the order of `(5A-2B)`=`3xxm=3xxn`

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