Answers

2016-02-18T14:52:45+05:30
Sum =(a1+an)*n/2
a1=7-4×1 =3
a17 =7-4×17= -61
sum = (3+(-61))*17/2
= -58*17/2
= -29*17
=-493//
sum of first 17th terms of the A.P is -493.
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