Let A be a 3 × 7 matrix, then each column of A contains:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 3 elements
A matrix of order m × n has m rows and n columns. A 3 × 7 matrix has 3 rows and 7 columns.
Each column takes one element from every row, so each column has 3 elements.
(Each row has 7 elements, and the matrix has 3 × 7 = 21 elements in all.)
NCERT (2026-27 edition):
Order of a Matrix
