Which term of the A.P. 24, 21, 18, ………… is the first negative term?
A. 8th B. 9th C. 10th D. 12th Answer: Option CShow Answer
Solution(By Apex Team)
$a_{n}=a+(n-1) \times d$ where d = -3,
$\text { Let } a_{n}=0$
$\begin{array}{l}
\Rightarrow 0=24+(n-1) \times-3 \\
\Rightarrow 0=24-3 n+3 \\
\Rightarrow 3 n=27 \\
\Rightarrow n=9
\end{array}$
$\Rightarrow 10^{\text {th }}$ term will be negative (-ve)
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