Sunday

March 29, 2015

March 29, 2015

Posted by **Anonymous** on Thursday, January 8, 2009 at 2:11pm.

- Math -
**bobpursley**, Thursday, January 8, 2009 at 3:37pmC=27!/25! * 10!/8! * 4!/2!2!

The last term represents the number of permuations of two letters, two numbers can be done (six ways).

- Math -
**Reiny**, Thursday, January 8, 2009 at 4:13pmmy approach:

first lets choose 2 letters and 2 numbers,

that is C(26,2)*C(10,2)

= 325*45

= 14625

let's consider one of these, say, DK45

now that could be arranged in 4! ways

so the total number of passwords is

14625*4! = 351000

bobpursley, when did they introduce that 27th letter?

**Answer this Question**

**Related Questions**

Integrated Math 1 - A valid password on a Web site contains 3 letters (A-Z, 26 ...

Permutations - A valid password on a Web site contains 3 letters (A-Z, 26 total...

Permutations - A valid password on a Web site contains 3 letters (A-Z, 26 total...

math - Elisa need to pick a numerical password that contains 4 digits using the ...

Algebra - A password consists of three digits, 0 through 9, followed by three ...

math check my work - a license plate has 2 letters followed by 4 digits.how many...

math please check my work - a license plate has 2 letters followed by 4 digits....

Statistics - Find the possible nuber of license plates consisting of 2 letters ...

Math110 - how many 6 - slots codes can be made up using 2 letters followed by 2 ...

Discrete Math - A special type of password consists of four different letters of...