AND, NOT, OR can be expressed with help of NAND

For 64 input lines at least 5 selection lines are required for MUX 

K-maps are not cyclic

For CMOS technology AND gate can be implemented with help of 6 FETs

MUX is used as a switch of several inputs to one output

An implicant (minterm) in K-map can have a width and length of 3