Friday

August 1, 2014

August 1, 2014

Posted by **Anonymous** on Sunday, August 28, 2011 at 1:38pm.

- math -
**Reiny**, Sunday, August 28, 2011 at 1:51pmnumber of total plates including all possible repetitions

= 26^4*100*26^2 = 30 891 577 600 (wow, enough until cars become "extinct")

so what we don't want are cases where all letters and numbers are different, which would be

26*25*24*10*9*23*22 = 710 424 000

so prob with some kind of repeats

= 1 - .710 424 000/30 891 577 600

= appr .9777 or 98% to the nearest percent

- math -
**MathMate**, Sunday, August 28, 2011 at 1:55pmThe licence plate template is

XXXXNNXX

with 6 letters and two numbers.

The number of licence plates without repetition, i.e. without choosing a previously used character or number is

=26.25.24.23.10.9.22.21

=C(26,6)*C(10,2)

The number of licence plates without regard to repetition is

=26^6*10*2

The probability P1 of getting a licence plate with**out**repetition is the first divided by the second.

The probability of getting a plate**with**repetition is 1-P1.

- math - correction -
**MathMate**, Sunday, August 28, 2011 at 2:06pmSorry,

26.25.24.23.10.9.22.21

is*not*C(26,6)*C(10,2)

The rest of the calculations should be good.

- my correction as well - math -
**Reiny**, Sunday, August 28, 2011 at 2:55pmlooks like this is the day for errors

I left out one of the letters in the first group of letters

should have said:

**so what we don't want are cases where all letters and numbers are different, which would be**

26*25*24*23*10*9*22*21 = 14 918 904 000

so the prob as asked in your question

= 1 - 14 918 904 000/30 891 577 600

= .517

**Related Questions**

stat - What is the probability of getting a license plate that has a repeated ...

ALGEBRA - What is the probability of getting a license plate that has a repeated...

ALGEBRA - What is the probability of getting a license plate that has a repeated...

Math - What is the probability of getting a license plate that has a repeated ...

alegbra - What is the probability of getting a license plate that has a repeated...

Algebra - What is the probability of getting a license plate that has a repeated...

math - suppose a license plate for a car has 4 letters followed by 1 number and ...

Computers - In Python - A state creates license plates, each containing two ...

college - if a license plate consists of 2 letters followed by 4 digits, how ...

math - A state's license plate number consists of 3 digits followed by 2 letters...