# Which term of AP 3, 8, 13, 18, …….. is 78?

**Answer: (3) A16 **

**Solution:-**

Let the nth term be 78.

First term (a) = 3,

d = 8 – 3

= 5.

**Formula-**nth term = a + (n – 1) d

Then,

3 + ( n – 1) 5 = 78

3 + 5 n – 5 = 78

5 n = 78 + 2

5 n = 80

n = 80/5

n = 16

Then, 16th term will be 78.

Hence, the correct answer is option (3) A 16.