February 21, 2017

Homework Help: Can someone help me?!

Posted by Jm on Thursday, January 3, 2013 at 6:06pm.

The 1st, 5th and 13th terms of an arithmetic sequence are the first three terms of a geometric sequence with a common ratio 2. If the 21st term of the arithmetic sequence is 72, calculate the sum of the first 10 terms of the geometric sequence.

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