As per given
a=72, d=-2, l=40
Therefore, l=a+(n-1)d
40=72+(n-1)(-2)
=72-2n +2
2
As per given
a=72, d=-2, l=40
Therefore, l=a+(n-1)d
40=72+(n-1)(-2)
=72-2n +2
2n=34
n=17
Now,the required sum of n terms,
=n/2(a+l)
=17/2(72+40)
=17/2*112
=17*56
=952
Struggling with your essay and deadlines⏰?
Get this or a similar paper done in as fast as 4 hours, 24/7✍.
NB: We do NOT sell prewritten papers. All essays are written from scratch according to are specific needs and instructions.
Secure Service, Plagiarism Free, On-time Delivery⭐.
NB: Our papers should be used for revision purposes.