Question

. Find the 20th term of the AP whose 3rd term
is 7 and the 7 term exceeds three times the
third term by 2. Also find its nth term an:​

Answer 1

A3=7

A7=3(A3)+2

A7=23

A7-a3= 16

4d=16

D=4

So, a=-1

A20= -1+19(4)= 75

An= -1+(n-1)4

-1+4n-4

4n-5

Please mark this as the brainliest answer