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In an A.P., if d = -4, n = 7, an = 4, then a is

A. 6 B. 7 C. 20 D. 28 Answer: Option D
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Solution(By Apex Team)

$\begin{aligned}\mathrm{a}_{\mathrm{n}}&=\mathrm{a}+(\mathrm{n}-1)\times\mathrm{d}\\ \Rightarrow&4=\mathrm{a}+(7-1)\times-4\\ \Rightarrow&4=\mathrm{a}-24\\ \Rightarrow\mathrm{a}&=4+24\\ &=28\end{aligned}$

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