Question

which term of AP 3,8,13.....is 78​

Answer 1

hope this helps you.....

Answer 2

a = 3 d= 5

now

a+(n-1)d = 78

or, 3+(n-1)5 = 78

or, (n-1)5= 78-3

or, (n-1) = 75/5

or, n= 16