find the sum of AP in -5+(-8)+(-11)+,,,,,,+(-230)
Answers
Answered by
27
this is the sum of the following A.P
Attachments:
Keerthi111:
my pleasure
but at the end its wrong
38(-235)=-8950
actually the answer is correct
but the answer is -8930
-235*38=-8930
yeah i am sorry
got confused
u are right
it's ok
Answered by
43
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
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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