Define a function as a correspondence between two sets.

Define a function as a set of ordered paris.

Define a function as a set of ordered pairs.

Define electric potential difference between two points.

Define electric potential difference between two points.

The number of function that can be defined from the set A = { a,b,c,d} into the set B= {1,2,3} is equal to

The number of functions that can be defined from a set containing 25 elements into a set containing 30 elements is

The number of functions that can be defined from a set containing 25 elements into a set containing 30 elements is

The number of functions that can be defined from a set containing 20 elements into a set containing 40 elements is