Question

Identify the following series as arithmetic, geometric, both, or neither.

Answer 1

Answer:

b

Step-by-step explanation:

Answer 2

Answer: First Option  is correct.

Step-by-step explanation:

Since we have given that

$\sum_{n=1}^{n=\infty}(3+an)$

Here, a = 3

So, our sequence becomes,

$3+a,3+2a,3+3a,................$

So, we can see that there is a common difference i.e. 'd'.

$d=a_2-a_1=3+2a-(3+a)=3+2a-3-a=a$

So, it becomes an arithmetic progression.

Hence, First Option is correct.