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The number of subsets of $\{1,2,3......,9\}$ containing at least one odd number is :

\[\begin {array} {1 1} (1)\;324 & \quad (2)\;396 \\ (3)\;496 & \quad (4)\;512 \end {array}\]

1 Answer

(3) 496
answered Nov 7, 2013 by pady_1
 
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