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If a matrix has 15 elements and 3 rows, how many columns does it have?

Answer and explanation

Correct answer: 5

Total elements = rows × columns. Let columns = n. Then \(15 = 3 \times n\), so \(n = 15/3 = 5\). Thus 5 is correct. Option C (12) likely comes from mistakenly doing 15−3; option D (18) would correspond to 3×6 and does not match 15; option A (3) gives 3×3 = 9, not 15. Exam tip: Use elements = rows × columns and divide the total elements by the number of rows to find columns.

Related tags

MatricesElementsColumnsRowsGrade12Order Of A MatrixMatrixMathematics

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