[color=#cc0000][b]Students: [/b][/color][br]If you enter a correct value, you'll see a big [color=#ff00ff][i][b]"Correct !!!"[/b][/i][/color] sign appear. [br][br][color=#0000ff][b]Repeat this exercise as many times as you need in order to master this concept! [/b][/color]