6. TBQ - Find the value of 'a' and 'b'

\(A\) has '\(a\)' rows and '\(a + 3\)' columns. \(B\) has '\(b\)' rows and '\(19 - b\)' columns, and if both products \(AB\) and \(BA\) exist, calculate \(a\), \(b\)?
 
Answer:
 
\(a\) \(=\)
 
\(b\) \(=\)
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