Question

Tell whether the sequence is arithmetic. If it is, what is the common difference?

Answer 1

I think the answer is c

Answer 2

Answer:  D. Yes ; -8

Step-by-step explanation:

An arithmetic sequence is given by :-

$a_1, a_2, a_3, a_4 , ........., a_n$ , where n is a natural number .

Here ,  differences between the successive terms is equal (d).

i.e. Common difference = $d=a_2-a_1= a_3-a_2=a_4-a_3$ and so on.

The given sequence : 19,11,3,-5

$a_2-a_1=11-19=-8$

$a_3-a_2=3-11=-8$

$a_4-a_3=-5-3=-8$

Since the differences between the successive terms are equal as -8.

So, the given sequence is an Arithmetic sequence with common difference = -8

Hence, the correct answer :  Yes , given sequence is an Arithmetic ; common difference =-8