Question: Problem 4 ( 1 0 points ) A sack contains n unbiased coins. Among them, n - 2 coins are normal ( i . e

Problem

4 (10

points

)

A sack contains

n

unbiased coins. Among them,

n - 2

coins are normal

(

.

.,

head on one side and tail on the other side

),

and two coins is fake, having tails on both sides. You pick a coin, uniformly at random, from the sack and flip it twice. You get tails both times. What is the conditional probability that you picked the fake coin?

Problem 4 ( 1 0 points ) A sack contains n

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