Construct a `3xx4` matrix `A=[a_(i j)]` whose elements `a_(i j)` are given by: (i) `a_(i j)=i+j` (ii) `a_(i j)=1-j` (iii) `a_(i j)=2i`

Explanation

To construct the \(3 \times 4\) matrix \(A = [a_{ij}]\) based on the given conditions, we will evaluate each part step by step.

### Part (i): \(a_{ij} = i + j\)

1. **Define the matrix structure**: We know that matrix \(A\) will have 3 rows and 4 columns.
\[
A = \begin{bmatrix}
a_{11} & a_{12} & a_{13} & a_{14} \\
...