Question

The common difference of an AP in which there are ' $n$ ' AM's between $a$ and $r$.

• A. $\frac{n}{2}(a+r)$
• B. $\frac{n}{2}(2a+nr-r)$
• C. $\frac{a\left(r^n-1\right)}{r-1}$
• D. ${\left(\frac{b}{a}\right)}^{\frac{1}{n+1}}$

Answer 1

Answer: (B)

$\frac{a-r}{n+1}$