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Grade: 12
        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........
3 years ago

Answers : (4)

Nicho priyatham
625 Points
							
6
plz approve if useful
3 years ago
Nicho priyatham
625 Points
							
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
 
3 years ago
Manoj Patra
22 Points
							
Thanks
3 years ago
Kushagra Mishra
34 Points
							
6
3 years ago
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