Question

If sn=n2, then find the value of a10​

Answer 1

sn= n^2

But s1= a1= a= 1^2= 1

a2= s2-s1= 2^2- 1= 3= a+ (2-1)d= a+ d

d= a2- a1= 3-1= 2

a10= a+ 9d= 1+ 18= 19

#BAL #answerwithquality