If \( \left[\begin{array}{ll}1 & 2 \\ 3 & 4\end{array}\right]\left[...

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If \( \left[\begin{array}{ll}1 & 2 \\ 3 & 4\end{array}\right]\left[\begin{array}{ll}3 & 1 \\ 2 & 5\end{array}\right]=\left[\begin{array}{ll}7 & 11 \\ k & 23\end{array}\right] \) then write the value of
\( \mathrm{P} \)
\( k \).
W
(1) 15
(2) 17
(3) 21
(4) None of these
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