2) Find the sums given below:
(i) -5 +(-8)+(-11)+...+(-230)
Answers
Answered by
4
Answer:
hope it helps you mate!
Attachments:
Answered by
9
Step-by-step explanation:
here a=-5
d=-8-(-5)=-3
an=-230
an=a+(n-1)d
-230=-5+(n-1)-3
-230+5=(n-1)-3
-225=-3n+3
-225-3=-3n
-228=-3n
by cancelling(-)
228=3n
n=228/3=76
Sn =n/2(2a+(n-1)d
Sn=n/2(a+an)
Sn=76/2(-5-230)
sn =38(-235)=-8930
plz plz plz plz follow me please
Similar questions