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Probability Videos 45 videos

Geometric Probability
3400 Views

Unfortunately, we cannot use geometric probability to determine the chances of you enjoying this video; it can only be used with shapes. Unless you...

ACT Math 3.2 Pre-Algebra
436 Views

ACT Math: Pre-Algebra Drill 3, Problem 2. What is the probability that a red queen will be drawn?

SAT Math 1.1 Numbers and Operations
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SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?

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GED Math 5.2 Measurement 180 Views


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Description:

GED Math 5.2 Measurement. Fill in the blank in this word problem.

Language:
English Language

Transcript

00:00

Thank you We sneak in pure shmoop too sure brought

00:05

to you by ball selection a really important skill If

00:08

you plan on going into professional single college aren't there

00:12

x number of ways to choose four balls in any

00:16

order from a total of twenty different balls x is

00:20

equal to the number of ways to choose blank balls

00:23

in any order from a total of twenty different balls

00:27

You got that read it carefully way have twenty balls

00:33

and we're choosing for them in any order and a

00:35

problem tells us that they're ex ember ways to do

00:38

that But then it tells us that there's some other

00:40

number of balls we could choose from the same set

00:43

twenty and the number of combinations would be the same

00:48

How is that possible But really just calls for us

00:50

to look at this thing a little differently when we

00:52

choose for the balls from twenty were also in a

00:55

way choosing the other sixteen at the same time No

01:00

it's the same in reverse Whether we choose four balls

01:02

or sixteen you will be the same number of ways

01:05

we can do it right way See that raised eyebrow

01:08

Get down Here's What works using the combination formula x

01:12

factorial over y factorial times the quantity x minus y

01:16

factorial Nothing wake unplugging our numbers in the first example

01:20

to get twenty factorial over four factorial times the quantity

01:23

twenty minutes for factorial or twenty factorial over for factorial

01:28

times sixteen factorial not right now before we do anything

01:32

else with it Let's see what happens if we use

01:34

sixteen balls instead of four legman who are formula And

01:38

we get twenty factorial over sixteen factorial times the quantity

01:41

twenty pectoral minus sixteen factorial or twenty factory over sixteen

01:46

factorial times for factorial This thing hey check it out

01:49

The two terms on the bottom are in different order

01:52

but they're still getting multiplied together Yeah Same z's name 00:01:56.273 --> [endTime] Thing or answer is sixteen Bingo

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