Question 1172462
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Between the 7th term and the 13th term of an AP, there are 13-7 = 6 equal gaps (intervals in the number line).


So, each such a gap is  {{{12/6}}} = 2.


Each gap length is the common difference of the AP.


Hence, the common difference of this AP is  2.      <U>ANSWER</U>
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Solved.


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Notice that the given value of the &nbsp;7th term &nbsp;(17) &nbsp;is an &nbsp;EXCESSIVE &nbsp;and &nbsp;UNECCESSARY &nbsp;info.