Find the sum : (-5) + (-8) + (-11) + ..... + (-230)
Answers (3)
13th Mar, 2020
Hi aspirant
n=4
a1 = -5. an= -230
S= n ( a1+an)/2
S= 4( -5-230)/2
S= 2(-235)
S= -470
n=4
a1 = -5. an= -230
S= n ( a1+an)/2
S= 4( -5-230)/2
S= 2(-235)
S= -470
Comments (0)
13th Mar, 2020
hi girish,
this is not a career related query but the answer is - 8930.
hope this will help
all the best for your future!!!!!!!!!!!!!
Comments (0)
Student Expert
13th Mar, 2020
Hello
Given series is an A.P.,
in which, a= -5, d= -8-(-5)=-3, l=-230
First calculate the number in series.....
l=a+(n-1)d
-230=-5+(n-1)-3
-225=-3n + 3
3n=228
n=76.
Now,
Sum of the series = n/2 (a+l)
76/2 (-5-230)
38 * -235 = -8930.
Thus , the sum of your series would be -8930.
Thank you
Given series is an A.P.,
in which, a= -5, d= -8-(-5)=-3, l=-230
First calculate the number in series.....
l=a+(n-1)d
-230=-5+(n-1)-3
-225=-3n + 3
3n=228
n=76.
Now,
Sum of the series = n/2 (a+l)
76/2 (-5-230)
38 * -235 = -8930.
Thus , the sum of your series would be -8930.
Thank you
Comments (0)
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