Question
Find $d$ if $t_9=23$ व $a=7$.

Answer

$\begin{aligned} & t_9=23 \quad { ......Given } \\ & \therefore 7+(9-1) d=23 \quad \ldots \ldots\left[t_n=a+(n-1) d\right] \\ & \therefore 7+8 d=23 \\ & \therefore 8 d=16 \\ & \therefore d=\frac{16}{8} \\ & =2\end{aligned}$

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