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The seventh and tenth terms of a geometric sequence are 7 and 21, respectively. What is the 8th term of this progression?

 
 Sep 8, 2021
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From the 7th to the 10th terms is multiplication by r   three times

7 * r * r * r = 21    solve for 'r'

      then the 8th term is  7 * r

 
 Sep 8, 2021

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