**Q) Write first four terms of the A.P. when the first term a and the common difference d are given as follows
(iv) a = – 1, d = 1 / 2**

**Ans: **Since we need to form AP consisting of first 4 terms, let’s start from formula for nth term.

The nth term of an AP,

here, a = first term

n = value of the term

d = common difference

Lets start putting value of a and d for different values of n and get the desired terms of AP.

First term,

Similarly, Second term,

Third term,

and Fourth term,

**Therefore, the Arithmetic progression with a = – 1, d = is , ….. and its first 4 terms are .**

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