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The total number of Boolean functions which can be realised with four variables is:

  1. $4$
  2. $17$
  3. $256$
  4. $65, 536$
asked in Digital Logic by Veteran (28.1k points)   | 65 views

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A Boolean function of 4 variables is a function from a set of $2^4 = 16$ elements (all combinations of 4 variables) to a set of 2 $(\{0,1\})$ elements. So, number of such functions will be $2^{16} =65,536$

answered by Veteran (43.2k points)  
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For a single variable say $x$ what all are the 4 functions?

Arjun are they 0,1,x & !x ?

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