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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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answered Nov 7, 2013 by pady_1

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