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Theory of equations

Quick practice

Question 1 of 5

The matrix \left[\begin{array}{lll} 1 & 0 & 0 \\ 0 & 2 & 0 \\ 0 & 0 & 3 \end{array}\right] is 

A

orthogonal matrix

B

skew symmetric matrix

C

diagonal matrix

D

 identity matrix

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