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\[\left[\begin{matrix}1 & -1 &2\\ 3 & -3&6\\-2&2&4\end{matrix}\right]\]

even i want to learn this..
so
*bookmark*

Do the gauss jordan elimination method and check how many leading ones there are

no. the third one is incorrect

given an nxm matrix
rankA + nullA = m

third would be 2?

soz third one is correct. it is 3

1 4 5
1 0 0
1 0 4
1 0 0
1 4 5
1 0 4
1 0 0
0 4 5
0 0 4

so
1 0 0
0 4 5
0 0 4
becomes
1 0 0
0 1 5/4
0 0 1
and that has three 1's so rank is 3

counting leading ones would suffice. yes, above is correct

thanks all!!