**CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.1 Question 3**

**3. For the following APs, write the first term and the common difference.**

**(i) 3, 1, -1, -3... (ii) -5, -1, 3, 7....**

**(iii) (iv) 0.6, 1.7, 2.8, 3.9,....**

**Solution (i)**

** 3, 1, -1, -3... **

First term = a= 3

Common difference (d) = second term - first term = third term - second term and so on.

Therefore, Common difference (d) = 1-3 = -2

**Solution (ii)**

**-5, -1, 3, 7....**

First term = a= -5

Common difference (d) = second term - first term = third term - second term and so on.

Therefore, Common difference (d) = -1-(-5) = -1+5 =4

**Solution (iii)**

First term = a=

Common difference (d) = second term - first term = third term - second term and so on.

Therefore, Common difference (d) =

**Solution (iv)**

**0.6, 1.7, 2.8, 3.9,....**

First term = a= 0.6

Common difference (d) = second term - first term = third term - second term and so on.

Therefore, Common difference (d) =