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[" 68.If "A" is a non-zero column matrix...

[" 68.If "A" is a non-zero column matrix of order "m times1" and "B" is "],[" non-zero row matrix of order "1times n," then rank of "AB" equa "],[[" (a) "m," (b) "n," (c) "1," (d) none of the "],[,,[[1,2,3,0]]]]

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