GATE Electrical 2023 | GA Question: 9

Question

\begin{tabular}{|l|l|}
\hline Q.9 & The digit in the unit's place of the product $3^{999} \times 7^{1000}$ is \\
\hline

• A. & 7 \\
  \hline
• B. & 1 \\
  \hline
• C. & 3 \\
  \hline
• D. & 9 \\
  \hline
  \end{tabular}