Question

find the common difference of A.P. 1/3,5/3,9/3,13/3 ,_______​

Answer 1

The only difference is the numerators are different and the denominators are same and the next set is 15/3 the difference is 1,5,9,13 which is 1+4=5 and 5+2=9 and 9+4 =13 so,13+2 will be 15