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Find the null space of the matrix A: (a) A =    1 1...

Find the null space of the matrix A:

(a) A =    1 1 2 2

   9 9 0 0

   6 7 1 2

   9 0 9 0  

(b) A = 2 1 0

−1 3 1

0 −1 4

 .

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