computer logic design question

Implement a full adder: Using two 8-to-1 MU Axes. Connect X, Y, and C in to the control inputs of the Mixes' and connect 1 or 0 to each data input. using two 4-to-1 Mixes' and one inverter. Connect X and Y to the control inputs of the Mixes', and connect 1 's, 0's, C in, or C in to each data input. again, using two 4-to- 1 Mixes', but this time connect C in and Y to the control inputs of the Mixes', and connect 1's, 0's, X, or X' to each data input. that in this fashion, any N- variable logic function may be implemented using a 2(N-1)-to-1 MUX