Answers

2016-07-19T22:57:52+08:00

the general formula

an= a1+(n-1)d
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2016-07-19T23:26:37+08:00
    an  =  3n-5    is arithmetic sequence  with  common difference  d   = 3
          the first term is  (3 .1) - 5   =    -2     /  n  = 1
           the 10th term   = 3 .10 - 5   = 25    /  n  = 10   and so on
      
          the sequence is     -2, 1, 4,7,10,13,16,19,22, 25...

      
          
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