find the sum of Ap in -5+(-8)+(-11)+....+(-230)
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a=-5 ; d=-3
l=a+(n-1) d=-230
-5+(n-1)×-3=-230
(n-1)×-3=-230+5
(n-1)=-225/3
n-1=-75
n=-74
sum=n/2 [2a+(n-1)d]
=-74/2 [-10+584]
=-37 ×574=-21238
Hope it helps!!!!
l=a+(n-1) d=-230
-5+(n-1)×-3=-230
(n-1)×-3=-230+5
(n-1)=-225/3
n-1=-75
n=-74
sum=n/2 [2a+(n-1)d]
=-74/2 [-10+584]
=-37 ×574=-21238
Hope it helps!!!!
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