Question

25+21+17+13+ ... +(-51), Find the sum of the given equation.

Answer 1

first we have to find the no. of terms in the AP by using the formula l=a+(n-1)d
after that we will apply the formula S=n/2(a+l) and after that the final answer is -1001 ....

Hope this would help you....
You can ask if any queries....

Answer 2

Step-by-step explanation:

A=25

D= -4

L= -51

L=A+(N-1)D

-51=25+(N-1)-4

-51-25=(N-1)4

-76/-4=N-1

19=N-1

19+1=N

20 = N

s=N/2(A+1)D

s=10(26)-4

s=-1040