# Math

"The probability of getting heads on a biased coin is 1/3. Sammy tosses the coin 3 times. Find the probability of getting two heads and one tail".

I thought that all you have to do is:
(1/3)(1/3)(2/3)

It makes sense to me, but it's not right...

1. 👍 0
2. 👎 0
3. 👁 174
1. Here are the possibilities:

HHT
HTH
THH

Each one has a probability of (1/3)(1/3)(2/3) = 2/27. For either-or probabilities, add the probabilities of the individual events.

1. 👍 0
2. 👎 0
posted by PsyDAG
2. I WOULD PUT IT AS A SIMPLE 1/3

1. 👍 0
2. 👎 0
3. use 3C2 (1/3)^2(2/3)1 in the calculator. (3c2 as in 3=number of trials, 2= number of successes, plug into the math>prob>ncr function. )

1. 👍 0
2. 👎 0
posted by John

## Similar Questions

1. ### Probability

Bob has two coins, A and B, in front of him. The probability of Heads at each toss is p=0.5 for coin A and q=0.9 for coin B. Bob chooses one of the two coins at random (both choices are equally likely). He then continues with 5

asked by stud81 on October 3, 2018
2. ### math

In a game, a player tosses a coin 4 times. If the player gets 3 or 4 heads, he/she wins. What is the theoretical probability of winning this game? I just need to know the outcomes. I don't know how to get them. Please and Thank

asked by Angela on May 30, 2007
3. ### Probability

Bob has two coins, A and B, in front of him. The probability of Heads at each toss is p=0.5 for coin A and q=0.9 for coin B.Bob chooses one of the two coins at random (both choices are equally likely).He then continues with 5

asked by Anonymous on October 6, 2018
4. ### Math

A biased coin lands heads with probabilty 2/3. The coin is tossed 3 times a) Given that there was at least one head in the three tosses, what is the probability that there were at least two heads? b) use your answer in a) to find

asked by Steve on June 13, 2018
5. ### Probability

Bob has two coins, A and B, in front of him. The probability of Heads at each toss is p=0.5 for coin A and q=0.9 for coin B. Bob chooses one of the two coins at random (both choices are equally likely). He then continues with 5

asked by stud81 on October 3, 2018
6. ### Math

A biased coin lands heads with probabilty 2/3. The coin is tossed 3 times a) Given that there was at least one head in the three tosses, what is the probability that there were at least two heads? b) use your answer in a) to find

asked by Steve on June 11, 2018
7. ### probability

urgent till 3 pm i have in colombia¡ 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

asked by Sakura1 on March 11, 2014
8. ### Math

A biased coin lands heads with probabilty 2/3. The coin is tossed 3 times a) Given that there was at least one head in the three tosses, what is the probability that there were at least two heads? b) use your answer in a) to find

asked by Steve on June 10, 2018
9. ### Probability

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

asked by qwerty on March 7, 2014
10. ### Probability

We have a red coin, for which P(Heads)=0.4, a green coin, for which P(Heads)=0.5 and a yellow coin for which P(Heads)=0.6. The flips of the same or of different coins are independent. For each of the following situations,

asked by Alex on November 24, 2018

More Similar Questions