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Sep 18, 2022
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If $\begin{bmatrix}a & c+d \\c-d & a+b \end{bmatrix}=\begin{bmatrix}3 & 5 \\9 & 10 \end{bmatrix}$ then b=?
Difficulty: Easy
A:
2
B:
8
C:
13
D:
7
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ID: 63273dbaca83163ac3a11a87