Question

for an A. P. 1/3 , 5/3 , 9/3 , 13/3 , .....

Answer 1

17/3......................

Answer 2

The numbers are in AP.

common difference (d)=5/3-1/3

=4/3

l=a+(n-1)d

=1/3+(n-1)4/3

=1/3+4n/3-4/3

=4n/3-3/3

=4n/3-1

=(4n-3)/3

:-)hope it helps u.