Suppose you know that 10% of 250 is 25. How could you use that information to find 30% of 250?
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This is the well known Monty Hall problem.
You have more chances of winning by switching doors.
Let A,B,C denote the events "The ferrari is behind A" and so on
Let HA,HB,HC denote the events "The host opens A" and so on
By Baye's formula,
whereas 
!!
You have more chances of winning by switching doors.
Let A,B,C denote the events "The ferrari is behind A" and so on
Let HA,HB,HC denote the events "The host opens A" and so on
By Baye's formula,
