Question

in an A.P. Sn=n^2+n,find first term​

Answer 1

Step-by-step explanation:

sn =n²+ n

for S 1

(1)²+1

=2

s=2

(2)²+2

=6

from above T1=2

finding t2

s2-s1

=6-2=4

t2=4

t1 is 2 and t2 is 4