Answers

2016-07-16T11:50:29+08:00
Given :

               a_{1}=2, a_{5}=162, r=?

Find the value of r using the formula of geometric sequence. So,
 
              a_{n}=a_{1}r^{n-1}
              162=2r^{5-1}
              162=2r^4
              81=r^4
              3=r

So, the common ratio of this sequence is 3.
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