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Consider an A.P. `a_1, a_2, a_n , ` and the G.P. `b_1,b_2, ,b_n , ` such that `a_1=b_1=1,a_9=b_9` and `sum_(r=1)^9a_r=369 ,` then `b_6=27` (b) `b_7=27` `b_8=81` (d) `b_9=81`

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MCGROW HILL PUBLICATION-PROGRESSIONS-SOLVED EXAMPLES LEVEL (Numerical Answer Type Questions)
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  11. Suppose a(1),a(2),… are real numbers such that sqrt(a(1))+sqrt(a(2)-1)...

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