Question

Which of the following is not an example of a series?

• A. $1,2,3,4,5,6,...$
• B. $-2,0,2,4,6,8,...$
• C. $1,1,2,3,5,8,..$
• D. None of the above

Answer 1

The correct option is D None of the above

$\left(A\right)$ $1,2,3,4,5,6,....$

This is a arithmetic series with common difference $d=1$

$\left(B\right)$ $-2,0,2,4,6,8,...$
This is a arithmetic series with common difference $d=2$

$\left(C\right)$ $1,1,2,3,5,8,...$
This is a Fibonacci series in which successive terms is determined by sum of 2 preceding terms.

$a_n=a_{n-1}+a_{n-2}$

Ans: None of the above