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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_1a_2a_3 5 4a_6a_7a_8a_9|` , then the value of `[D]i sw h e r e[dot]` represents the greatest integer function

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