19.In GP, 2nd term is 9/4, 8th term is 16/81 then common ratio of this series is.
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a*R= 9/4. (1)
and a*R⁷ = 16/81 (2)
a is first element and R is proportional.
a is first element and R is proportional. by division
R⁶=64/729
R=2/3
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