Posted by **Sakura1** on Tuesday, March 11, 2014 at 8:56am.

urgent till 3 pm i have in colombiaˇ

1 Alice has five coins in a bag: two coins are normal (i.e., fair with one face Heads and the other face Tails), two are double-headed (i.e., both sides are Heads), and the last one is double-tailed (i.e., both sides are Tails). She reaches into the bag and randomly pulls out a coin, with each coin being equally likely to be selected. Without looking at the coin she drew, she tosses it once.

What is the probability that the side of the coin that lands face-down is Heads?

2 The coin lands and shows Heads face-up. Given this information, what is the probability that the face-down side is also Heads?

3Alice discards the coin used in the first round. She knows that it showed Heads face-up but does not look at the other side of the coin. She reaches again into the bag and draws out a second coin from the 4 remaining coins, with each coin equally likely to be selected. Again, without looking at this second coin, she tosses it once. Given her knowledge of the result of the first coin toss (i.e., that it landed Heads face-up), what is the probability that this second coin toss results in Heads face-up?

## Answer this Question

## Related Questions

- Probability - Alice has five coins in a bag: two coins are normal (i.e., fair ...
- Math - Four coins fall onto the floor. Find the probability that (a) exactly ...
- MATHS - Three fair coins are tossed at the same time. What is the probability ...
- MATHS - Three fair coins are tossed at the same time. What is the probability ...
- math - Suppose I have 8 coins.4 of them have heads on both sides and the other 4...
- Math (please help!) - You have 16 coins that are heads up and 18 coins that are ...
- Math - You have 16 coins that are heads up and 18 coins that are tails up. After...
- Math - You have 16 coins that are heads up and 18 coins that are tails up. After...
- probability - you have 16 coins that are heads up and 18 coins that are tails up...
- math - you have16 coins that are heads up an18 coins that are tails up. After ...

More Related Questions