Question

which turn of the ap :3,8,13,18,.......is 78

Answer 1

Answer:

16th term is 78

Step-by-step explanation:

Given AP series,

3,8,13,18,....78

in an AP,nth term is given by

a(n) = a + (n-1)d

where a is first term

           d is common difference

=> In the given series,

a = 3 ;

d = 8-3 = 5 ;

a(n) = 78

=> 78 = 3 + (n-1)(5)

   78 - 3 = (n-1)(5)

  75 = (n-1)(5)

  n-1 = 75/5

 n-1 = 15

 n = 16

16th term is 78