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Q)

Choose the correct answer if $10^n+3.4^{n+2}+k$ is divisible by 9 for all $n \in N$, then the least positive integral value of $k$ is

$\begin{array}{1 1}(A)\;5\\(B)\;3 \\(C)\;7 \\(D)\;1 \end{array} $

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