how do i get this loop to print backwards? So starting from 21 instead of 0. Java

public class Main { public static void main(String[] args) { for (int i = 0; i <= 21; i += 3) { System.out.println(i); } } }

also:

What values make this boolean equation evaluate to true?

!a || !b && !c && d

answers:

1) a = false, b = false, c = false, d = false

2) a = true, b = false, c = false, d = false

3)	a = true, b = true, c = true, d = false

4)	a = false, b = false, c = false, d = true

5)	a = true, b = true, c = true, d = false