JEE PYQ: Matrices And Determinants Question 26
Question 26 - 2021 (26 Feb Shift 1)
Let $A$ be a $3 \times 3$ matrix with $\det(A) = 4$. Let $R_i$ denote the $i^{th}$ row of $A$. If a matrix $B$ is obtained by performing the operation $R_2 \to 2R_2 + 5R_3$ on $2A$, then $\det(B)$ is equal to:
(1) $64$
(2) $16$
(3) $80$
(4) $128$