Class 11

Math

Algebra

Sequences and Series

The common difference for even number of terms written in symmetrical manner for an arithmetic progression have a common difference of ?

- $d$
- $2d$
- $3d$
- $−2d$

**Correct Answer: ** Option(b)

**Solution: **An even number of terms written in symmetrical manner for an arithmetic progression is for example $a−3d,a−d,a+d,a+3d$, where the common difference is $2d$. Thus the correct answer is $b$.