If x + y + z = 18, xyz = 81 and xy + yz + zx = 90, then find the value of \sqrt{ {\x}^3+ {\y}^3+ {\z}^3+ {\xy} {\z}}.

SSC CGL 13 Apr 2022 Shift 2 Paper

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If x + y + z = 18, xyz = 81 and xy + yz + zx = 90, then find the value of

√{ {\x}^3+ {\y}^3+ {\z}^3+ {\xy} {\z}}

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