Saturday

April 18, 2015

April 18, 2015

Posted by **matt** on Sunday, April 13, 2008 at 8:45pm.

four numbers. Find the number of possible passwords if there are no

restrictions on what three letters and what four numbers can be used.

- maths permutation and combination - answer pls check -
**matt**, Sunday, April 13, 2008 at 9:06pmPls check if my answer is correct

26C3*10C4

=26!/(26-3)!3! . 10!/(10-4)!4!

= 26*25*24*23!/23!*6 . 10*9*8*7*6!/6!*4*3*2*1

=15600/6 * 5040/24

=2600*210

=546000

- maths permutation and combination -
**bobpursley**, Sunday, April 13, 2008 at 9:38pmI didn't see that letters or numbers cant be used more than once.

26*26*26*26*10*10*10*10

As I read it AAAA0000 is allowed, your number didn't include those.

- maths permutation and combination -
**matt**, Sunday, April 13, 2008 at 9:44pmThanks

**Answer this Question**

**Related Questions**

maths permutation & combination - answer pls check - Your password for a given ...

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...

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

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

Probability(math) - How many computer passwords can be created with three digits...

math - teresa has to create a password that contains 1 digit and 2 letters. find...

Math - A password consists of 2 letters and 2 digits (0-9). The letters and ...

math - a book club assigns to each member a membership number that consists of 2...

Algebra - 42. Which number best represents this set of data: 5, 5, 5, 6, 5, 5, 5...