Question

An example of the odd number of terms in an arithmetic progression written in a symmetrical format is?

• A. $a-d,a,a+d$.
• B. $a,a+d,a+2d$.
• C. $a-2d,a-d,a$.
• D. $a-d,a+d,a+3d$.

Answer 1

The correct option is A $a-d,a,a+d$.

An example of odd number of terms written in an arithmetic progression is $a-d,a,a+d$. where the term in the centre is $a$ and the ones after and before it are written by adding or subtracting $d$ to form a symmetrical pattern of terms. Thus, the correct answer is $a$.