Question

Ian ap Sn=5n+3,then find the value of a4​

Answer 1

sn=5+3

the value of sn and put n=1,2,3,and

S1= 5(1)+3=8

S2=5(2)+3= 13

S3=5(3)+3=18

S4=5(4)+3=23

the list of an ap is 8,13, 18,23

the value of a4=23.