# GATE Papers >> CSE >> 2014 >> Question No 116

Question No. 116

The dual of a Boolean function F(x1, x2, … , xn, +, · , ′ ), written as FD, is the same expression as that of F with + and ⋅ swapped. F is said to be self-dual if F = FD. The number of self-dual functions with n Boolean variables is