Find the sum of 23 terms of the AP 17, 12, 7, 2, –3, ….

To Find: The sum of 25 terms of the given AP series.


Sum of n terms of an AP with first term a and common difference d is given by



Here, a = 17, n = 23 and d = - 5





= - 874


Sum of 23 terms of the AP IS - 874.


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