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## Homework Statement

Can anyone help me figure out basis for RS(A) and basis for CS (A) along with their dimension?

I mean dim CS(A) and dim RS(A)

where A is

[1 -2 4 1]

[0 7 -15 -4]

[0 0 0 0]

## Homework Equations

## The Attempt at a Solution

are all non zero rows the basis for RS (A)?