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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:

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

$(2)\;2^n-1$
answered Nov 7, 2013 by pady_1
 

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