Question

the sum of n terms of an AP is 7n2-2n. find the ap and the 10th term​

Answer 1

700-20

680 will be answer

Answer 2

Step-by-step explanation:

7n/2-2n

put n=1first then you will get

7/2-2

=3/2

then put n=2

then youwill get

-1/2

as we know

S2-S1=a1

so

-1/2-5/2

i.e. -3which is a1

do the same procedure

you will get the AP