Thanks guys, but it seems that there is some discordance about the calculation of P(three dice showing the same face):
sunil4gmat said - 4C3 * 6/6^4 = 24/6^4 OR
alive_zombie said - 4C3.(5.6/6^4)
I believe alive_zombie is correct, but since I don't have an official answer... What do you think sunil4gmat?
Thanks.