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If A is a non-zero column matrix of order n×1 and B is a non-zero row matrix of order 1×n then rank of AB equals ?

Rank(ab) can be zero???

your question is about column matrix $\times$ row matrix, not  row matrix $\times$ column matrix.

@ankitgupta.1729

sorry, my mistake

Thank you

Wrong multiplication

$A,B \ are\ non-zero\ matrices\ so\ matrix\ AB\ will\ be\ non-zero\ matrix$

$There\ will\ have\ at\ least\ one\ non-zero\ element.$
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