What is the flux through a cube of side $a$ if a point charge of q is at one of its corner?

Question

${{2q} \over {{\varepsilon _0}}}$

${q \over {8{\varepsilon _0}}}$

${q \over {{\varepsilon _0}}}$

${q \over {2{\varepsilon _0}}}6{a^2}$

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