Question

if a=20,an=300,n=40 find sn​

Answer 1

Sn =600

please mark as Brainliest answer

Answer 2

using the formula=sn = n/2(a+l)

Step-by-step explanation:

a=20 ,n=40 ,an= l= 300

sn =40/2(20+300)

sn=20(320)

sn=6400