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Answer will be 3 assuming that $\Sigma = \{ a\}$ Or It will be $4$ if $\Sigma \supset \{ a \} $

The language $L = \Sigma^* - \{ \in,a\}$ 

If $\Sigma = \{ a\}$ then the Minimal DFA would look like the following :

If $\Sigma \supset \{ a \} $ then Minimal DFA will look like the above but with one Dead State extra. 

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