How many terms are there in 20, 25, 30 . . . . . . 140?
A. 22 B. 25 C. 23 D. 24 Answer: Option BShow Answer
Solution(By Apex Team)
$\begin{aligned}&\text{Number of terms,}\\
&=\frac{\left(\text{ last term }-1^{\text{st}}\text{ term }\right)}{\text{Common difference}}\text{ }+1\\
&=\frac{140-20}{5}+1\\
&=\frac{120}{5}+1\\
&=24+1\\
&=25\end{aligned}$
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