How can I generate a random number within a range but exclude some?

Question

How can I generate a random number within a range but exclude some, without keep generating and checking if the generated number is one of those that I want to exclude?

Answer 1

exclude numbers should be with in range parameter

private int GiveMeANumber(int range,int... exclude)
{

    Set integers=new HashSet<>();
    int count=range;

    for(int i=0;i