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How many 6 digit numbers can be formed using the digits $1,2,3$ so that the digit 1 occur 2 times in each number?

$\begin{array}{1 1} 2^4.^4C_2 \\ ^6C_2 \\ 4^2.^6C_2 \\ 2^4.^6C_2 \end{array}$

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