Quandaries
and Queries 

Name: Michael Who is asking: Student Question: 

Hi Michael, A geometric sequence has a particular pattern defined by two numbers, a, the first term and r, the common ratio. The pattern is that you start with the first term, a and then if you have any term in the sequence, to get the next term you multiply the term you have by r. Hence you have
In your sequence the sum of the 2nd and 3rd terms is 60 and hence
Use the fact that the sum of the 3rd and 4th terms is 240 to find a second equation and then solve the equations for a and r. Penny 

