Forwhich of the values of n and k given below, does there exists a function of n variables that has k distinct variants? (Jus-tify/prove your answers.)
a. n=4,k=4
b. n=5,k=4
c. n=5,k=5
d. n=6,k=1
e. n=6,k=3
f. n=6,k=4
g. n=7,k=6