If `A ,\ B` are square matrices of order `3,\ A` is non-singular and `A B=O` , then `B` is a (a) null matrix (b) singular matrix (c) unit matrix (d) non-singular matrix

Explanation

We have given `A`,`B` are square matrices of order 3.

And also,` A` is non-singular and `AB=O`

As A is non-singular then `A^(-1)` exists

Now `AB=O`

Now multiply by `A^(-1)` from left

`A^(-1)AB=A^(-1)O`

`B=A^(-1)O`

`B=O`

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