find the sum of the following APs :1)-5+(-8)+(-11)+………to+(-230) terms
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Answer:
Step-by-step explanation:
a= -5
d= -3
L= -230
L= a+(n-1)d
-230= -5+(n-1)-3
-225 = -3n + 3
-228= -3n
n=76
Sn= n/2 (2a+(n-1)d)
= 76/2 (2(-5) + (76-1) -3)
38(-10-225)
38×-235
Sn= -8930
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