Q.

 If a1,a2,a3,5,4,a6,a7,a8,a9 are in H.P., and D=a1a2a354a6a7a8a9, then the value of [D]  is (where [.] represents the greatest integer function) 

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answer is 2.

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Detailed Solution

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We have D=a1a2a354a6a7a8a9
 Since an=20n;d=120
Hence, D=20202203204205206207208209 =(20)34×7112131452317879
R1R1R2 and R2R2R3

=5021 D = 2

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 If a1,a2,a3,5,4,a6,a7,a8,a9 are in H.P., and D=a1a2a354a6a7a8a9, then the value of [D]  is (where [.] represents the greatest integer function)