If \( A=\left[\begin{array}{ll}1 & 2 \\ 5 & 6\end{array}\right], B=...
If \( A=\left[\begin{array}{ll}1 & 2 \\ 5 & 6\end{array}\right], B=\left[\begin{array}{cc}3 & 5 \\ x & -4\end{array}\right] \) and \( A+B=\left[\begin{array}{ll}4 & 7 \\ 6 & 2\end{array}\right] \),
\( \mathrm{P} \)
then the value of \( x \) must be
(1) 6
(2) 1
(3) 0
(4) -1
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