Question

what is formula of arthritic progression

Answer 1

for finding n terms:-an=a+(n-1)d
sum of n terms:-sn=n/2(2a+(n-1)d
number of terms is in the form of
-etc, .........,,a-2d, a-d, a, a+d,a+2d,a+3d,,......,+etc

thank u

Answer 2

finding n terms:-an=a+(n-1)d
sum of n terms:-sn=n/2(2a+(n-1)d
number of terms is in the form of 
a,a-2d, a-d, a, a+d,a+2d,a+3d,,......,+etc
thank you