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# A binary sequence is an array of $0's$ and $1's$. The number of n-digit binary sequences which contain even number of $0's$ is:

$\begin {array} {1 1} (1)\;2^{n-1} & \quad (2)\;2^n-1 \\ (3)\;2^{n-1}-1 & \quad (4)\;2^n \end {array}$

$(2)\;2^n-1$