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If `a_(1)`, `a_(2)`, `a_(3)`, `5`, `4`, `a_(6)`, `a_(7)`, `a_(8)`, `a_(9)` are in `H.P.` and the value of the determinant `|{:(a_(1),a_(2),a_(3)),(5,4,a_(6)),(a_(7),a_(8),a_(9)):}|` is `D` then the value of `21 D//10` is

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