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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2016
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Q)
If $A= \begin{bmatrix} 5a & -b \\ 3 & 2 \end{bmatrix}$ and $A \; adj \; A = A A^T$, then $5a + b$ is equal to :
( A ) $-1$
( B ) $5$
( C ) $13$
( D ) $4$
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