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Grade: 11
        
In a GP the ratio of the sum of the first eleven terms to the sum of last eleven terms is 1/8 and the rati of the sum of all the terms without the first nine to the sum of all the terms without the last nine terms is 2. Find the number of terms in the GP.
one year ago

Answers : (1)

Vijay
13 Points
							
From first condition we have (r) ^(n-11)=8 and from second condition we have r^9=2 . Solving we will have n=38. 
 
one year ago
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