Question 1191407
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Not enough information.  We need some information from which we can determine the number of terms.<br>
The sum of the terms of an AP is the number of terms, multiplied by the average of all the terms; and in an AP the average of all the terms is the average of the first and last terms.<br>
The average of the first and last terms in this example is (60-104)/2 = -22.<br>
So if the number of terms is n, the sum of the terms is -22n.<br>
2 terms: 60, -104
sum: -44 = 2(-22)<br>
3 terms: 60,-22,-104
sum: -66 = 3(-22)<br>
4 terms: 60,16/3,-148/3,-104
sum: -88 = 4(-22)<br>
etc....<br>