1. Tardigrade
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  4. Let A be the 2 × 2 matrices given by A=[ai j] where ai j ∈ 0,1,2,3,4 . Such that a11+a12+a21+a22=4. The number of matrices A such that A is invertible are

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Q. Let $A$ be the $2 \times 2$ matrices given by $A=\left[a_{i j}\right]$ where $a_{i j} \in\{0,1,2,3,4\}$. Such that $a_{11}+a_{12}+a_{21}+a_{22}=4$.
The number of matrices $A$ such that $A$ is invertible are

Matrices

Solution:

Correct answer is (a) 18