The sum of the first eight terms of a geometric series is 10,001 times the sum of its four terms . Find the common ratio of these series Choose the correct choice from the following answers
A) 1000  B) 1  C) 10  D) 100  E) 0.1
a (r^ 8 - 1)/(r - 1 ) = 10001 a (r^ 4 –1)/(r – 1)   r ^4 +1 = 10001, r =10   ANSWER:10
<result>C</result>
The sum of the first eight terms of a geometric series is 10,001 times the sum of its four terms . Find the common ratio of these series