This video demonstrates the monty hall problem, named after the host of the game show "let's make a deal" that originally aired in the 1960s and 1970s. in this show, contestants picked one of three curtains, one of which had a car behind it and the other two had goats. after contestants chose a curtain, monty hall showed the contestant what was behind one of the two curtains the contestant had not chosen. then he offered the contestant the option to switch her choice.
a. 3
b. 10
c. 20
d. 40