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In an increasing gp the sum of the first and the last term is 66. The product of the second and the last but one is 128 and the sum of the sum of the terms is 126 ..then the no. Of terms in the series is........

Manoj Patra , 10 Years ago
Grade 12
anser 4 Answers
Nicho priyatham
6
plz approve if useful
Last Activity: 10 Years ago
Nicho priyatham
a+arn-1=66
ar*arn-2=128
a(rn-1)/(r-1)=63
solving 1 and 2 we get 
rn-1=32
so rn=32r put it in equation 3
to get r=2
 
Last Activity: 10 Years ago
Manoj Patra
Thanks
Last Activity: 10 Years ago
Kushagra Mishra
6
Last Activity: 10 Years ago
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