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Mathematics 66 Online
OpenStudy (anonymous):

Adam has 4 dimes, 4 quarters and 4 nickels in his pocket. He pulls out 2 coins making sure to put the first one back in his pocket before picking the second. What are the odds that he pulls out 2 nickels?

OpenStudy (anonymous):

Remember what we did for the last problem

OpenStudy (anonymous):

yess can u help me please?

OpenStudy (anonymous):

Ofcourse

OpenStudy (anonymous):

Here is a formula for you: Odds = (Dimes + Nickels + Quaters) Divided By: Number of coins pulled out.

OpenStudy (anonymous):

so itll be 4+4+4+2+2=16/by 5=4?

OpenStudy (anonymous):

Sorry the divide part is actually before (Dimes....)

OpenStudy (anonymous):

haha

OpenStudy (anonymous):

No add the totoal amount of coins, What is that equal to?

OpenStudy (anonymous):

*total

OpenStudy (anonymous):

16

OpenStudy (anonymous):

Correct

OpenStudy (anonymous):

:)

OpenStudy (anonymous):

Now odds is always like this X out of Y == X/y which means if there is a 1 out of 3 then its 1/3. Try to use this logic to help you get your answer

OpenStudy (anonymous):

ok so itll be 1/3?

OpenStudy (anonymous):

Not for this problem. remember that was an example.

OpenStudy (anonymous):

oh cause they have that answer? i was just wondering!

OpenStudy (anonymous):

oh lol no. Plug in the numbers from your problem with my example. Number out of Number = Number/Out of Total Amount.

OpenStudy (anonymous):

i got 1/9

OpenStudy (anonymous):

Ok lets try it like this . How many coins pulled out at a time?

OpenStudy (anonymous):

he pulled out 2

OpenStudy (anonymous):

ok so we have number pulled out equals 2. Now we need the total amount of coins that are inside his pocket. What is that?

OpenStudy (anonymous):

he has 16

OpenStudy (anonymous):

ok so your anwer will be Number pulled out / Total Inside pocket. So what is your answer?

OpenStudy (anonymous):

1/16?

OpenStudy (anonymous):

How many does he pull out at a time?

OpenStudy (anonymous):

2

OpenStudy (anonymous):

Ok so its not 1/16 but ?/16

OpenStudy (anonymous):

What is missing?

OpenStudy (anonymous):

thats the only answer with a 16 in itt

OpenStudy (anonymous):

Right but answer mine we are getting there

OpenStudy (anonymous):

2/16

OpenStudy (anonymous):

Correct. But they said that he puts one back after he pulls 2. So that means 2-1/16 which is 1/16. Understand?

OpenStudy (anonymous):

kinda

OpenStudy (anonymous):

He pulls out 2 then puts one back so it is 1/16 instead of 2/16.

OpenStudy (anonymous):

ohh!

OpenStudy (anonymous):

Now you get it?

OpenStudy (anonymous):

yess! so is that the answer?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

actually wait no

OpenStudy (anonymous):

huh?

OpenStudy (anonymous):

Sorry the total number of coins is 12 not 16. I added an extra 4. So sorry. Its 1/12 or 2/12. Do you have any of those answers?

OpenStudy (anonymous):

no but i have 1/16

OpenStudy (anonymous):

do you have 1/6?

OpenStudy (anonymous):

no i have 1/3,1/16,1/9,1/81

OpenStudy (anonymous):

1/3 is your answer

OpenStudy (anonymous):

1/3, then 2/6, then 4/12

OpenStudy (anonymous):

4 out of 12 chance and if you simplify its 1/3 or 4 Divided by 4 / 12 divided by 4. Get it

OpenStudy (anonymous):

yess

OpenStudy (anonymous):

Ok sorry about the confusion earlier.

OpenStudy (anonymous):

There you go I gave you a medal

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