const int RGBredPin = 11;  
const int RGBgreenPin = 10;  
const int RGBbluePin = 9;  
const int red = 3;
const int green = 2;
const int blue = 1;

bool firstLoop = true;

void setup()
{ 
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(RGBredPin, OUTPUT); 
  pinMode(RGBgreenPin, OUTPUT); 
  pinMode(RGBbluePin, OUTPUT); 
}    

void loop() 
{    
  if(firstLoop)
  {
    // Firstly Turn on Red Led
    digitalWrite(red, HIGH);
    digitalWrite(green, LOW);
    digitalWrite(blue, LOW);
    digitalWrite(RGBredPin , LOW);
    digitalWrite(RGBgreenPin , LOW);
    digitalWrite(RGBbluePin, LOW);
    delay(1000);
    firstLoop = false;
  }
  // Turn on Green Led and (Red+Green) in RGB Led
  digitalWrite(red, LOW);
  digitalWrite(green, HIGH);
  digitalWrite(blue, LOW);
  digitalWrite(RGBredPin, HIGH);
  digitalWrite(RGBgreenPin, HIGH);
  digitalWrite(RGBbluePin, LOW);
  delay(1000);

  // Turn on Blue Led and (Green+Blue) in RGB Led
  digitalWrite(red, LOW);
  digitalWrite(green, LOW);
  digitalWrite(blue, HIGH);
  digitalWrite(RGBredPin, LOW);
  digitalWrite(RGBgreenPin, HIGH);
  digitalWrite(RGBbluePin, HIGH);
  delay(1000);

  // Turn on Red Led and (Blue+Red) in RGB Led
  digitalWrite(red, HIGH);
  digitalWrite(green, LOW);
  digitalWrite(blue, LOW);
  digitalWrite(RGBredPin , HIGH);
  digitalWrite(RGBgreenPin , LOW);
  digitalWrite(RGBbluePin, HIGH);
  delay(1000);

  // Repeat the sequence
}