Question

Maximum Number of Variables Used to Draw a K-Map
The maximum number of variables that are used to draw a K-map are: a) 2 b) 4 c) 3 d) 5.

Answer 1

perhaps the answer is  4 variables.

We can group 16 squares together belonging to 4 variables, also to make K-map for a larger number of variables too.  Thus we can make 5-variable K- map that consists of two 4-variable K-maps.

We can make a 6-variable K-map by combining 4 of 4-variable K-maps.