in the game of tennis a player has two serves.
if the first serve is succesful the gamae continues.
if the first serve is not succesful the player serves again. if this second service is succesful the game continues.
if both serves are unsuccesful the player has served a "double fault"and loses the point.
Gabriella plays tennis. she is succesful with 60% of her first serves and 95% of her second serves.
calculate the probability that gabriella serves a double fault.