Question

If $p,q,r,s,t$ and $u$ are in A.P. then difference $(t-r)$ is equal

• A. $2(s-p)$
• B. $2(u-q)$
• C. $2(s-r)$
• D. $(u-q)$

Answer 1

The correct option is C $2(s-r)$

$2s=r+t\Rightarrow t=2s-r$
$\Rightarrow t-r=2s-2r=2(s-r)$