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Which of the following don’t use matrices?

(a) In solving linear equations

(b) Image processing

(c) Graph theory

(d) Sorting numbers

The origin of the question is Matrix in division Arrays Types of Data Structures & Algorithms I

I got this question in exam.

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The correct answer is (d) Sorting numbers

Best explanation: Numbers uses arrays(1-D) for sorting not matrices(2-D arrays). Solving linear equations is a separate field in Mathematics involving matrices, Image processing stores the pixels in the form of matrices, and the graphs are represented with the help of matrices to indicate the nodes and edges.

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