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In an A.P., if d = -4, n = 7, $\mathbf{a}_{\mathbf{n}}$ = 4, then a is

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

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

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