Mark the tick against the correct answer in the following:

Question:

Mark the tick against the correct answer in the following:

The solution set of the equation $\left|\begin{array}{lll}a+x & a-x & a-x \\ a-x & a+x & a-x \\ a-x & a-x & a+x\end{array}\right|=0$ is

A. $\{a, 0\}$

B. $\{3 a, 0\}$

C. $\{a, 3 a\}$

D. None of these

Solution:

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