Question

write the formula an=_____ and sn =_____ where, a=___ ,d=___ n=___ an=____​

Answer 1

Answer:

an = a + (n-1)d

sn = n/2[2a + (n-1)d]

= n/2(a + l)

where,a = first term if A.P.

d = common difference

n = no. of terms

an = nth term