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If a1, a2, a3,54,a6,a7, a8, a9 are in H....

If `a_1, a_2, a_3,54,a_6,a_7, a_8, a_9` are in H.P., and `D=|[a_1,a_2,a_3],[5, 4,a_6],[a_7,a_8,a_9]|` , then the value of `[D]i sw h e r e[dot]` represents the greatest integer function

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