Question

Which sequence represents a finite arithmetic sequence?

• A. $1+4+7+\mathrm{11.....}$
• B. $4,20,100,14$
• C. $2,5,8,\mathrm{11...}$
• D. $11,1,-9,-19,-29$

Answer 1

The correct option is D $11,1,-9,-19,-29$

Finite arithmetic progression is $11,1,-9,-19,-29$. Here common difference is $-10$.
A sequence of the type $a,a+d,a+2d,a+3d$ is said to form an finite A.P.
Where $a=$ first number
and $d=$ common difference

Rest all options are different sequences.