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In a geometric series the second term is 3, the fifth term is 81.

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Find the third term?

asked Jun 15, 2013 in ALGEBRA 2 by linda Scholar

1 Answer

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Let the second term in the geometric series be a2 = 3

Let the fifth term in the geometric series be a5 = 81

In a geometric series the nth term image

 Given that  image      and     image

                   image                            image       

                                                             image                 

                                                               image

                                                                 image

                                                                 image

  Therefore image

  Therefore the third term image

                                              image

Therefore the third term image

 

answered Jun 15, 2013 by joly Scholar

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