Question

A box contains 9 new light bulbs and 6 used light bulbs. Each light bulb is the same size and shape. Meredith will randomly select 2 light bulbs from the box without replacement. What is the probability Meredith will select a new light bulb and then a used light bulb

Answer 1

What do you think first thing to do is?

Answer 2

I believe you are supposed to add that 9 and 6 to get 15.

Answer 3

Not quite, it's asking for probablitly...which is usually referring to percentages

Answer 4

Okay, what kind of equation do you think you need to use here? Combination or Permutation

Answer 5

I honestly don't know

Answer 6

So you were right about adding them, but I would go further

Answer 7

Read this for a hint: https://askanydifference.com/difference-between-permutation-and-combination/#:~:text=The%20difference%20Between%20Permutation%20and%20Combination%20are%20clearly,arrangements%20is%20denoted%20by%20nPr.%20More%20items...%20

Answer 8

Say 15 is 100% of the lightbulb total

Answer 9

Okay.

Answer 10

After that, it's wanting us to find what is the probability of us picking a new lightbulb then a new one.

Wait, scratch those thoughts...
For everyone one used lightbulb, there are three new ones

Answer 11

Uh huh. That would be three then.

Answer 12

So what do you think the probability of that would be in a ratio form?
*remember, ratio form is like 5:1*

Answer 13

I'm believing it would be 3:1, since there are three new lightbuls for each one used lightbulb

Answer 14

Mkay! :D

Answer 15

Thank You MrMudd! Thank You! ^w^

Answer 16

You're welcome C-:

And to give someone a medal for if you think it's the best response, click/tap on the "Best Response" button to give that person a medal

Answer 17

There you go! ^w^

Answer 18

Thank ya, if you need any more assistance feel free to @ me

Answer 19

Mkay!