the 12th term of an arithmatic series is 42 and the sum of the first 17 terms is 51. find the common difference of the series and the first three terms.

• 12th term is 42 i.e. a+11d=42
  Sum of 17 terms is 51 i.e. (17/2)(2a+16d)=51
  solving we get d=13 and a=-101
  so, 1st three terms are -101, 88, 101
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