In a 3 x 4 matrix, the rows are _ and the columns are _.
Rows are represented by 3, columns by 4.
In a 3 x 4 matrix, the rows are horizontal and represented as R1, R2, and R3, while the columns are vertical and represented as C1, C2, C3, and C4. Each entry in the matrix can be denoted by its row number and column number, such as R2C3 for the entry in the second row and third column.
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