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Posted by **alejandro** on Monday, August 5, 2013 at 2:00pm.

Answer: Old code: 5x5x5x5x5x5=15325

New code: 5x5x10x10x10=25000

The increase in the number of codes is 9375.

I don't understand why they use 5's and 10's!!!Please somebody can explain me this!!!

- math30 -
**Reiny**, Monday, August 5, 2013 at 3:10pmhow many

**even**digits are there from 0 - 9 ??

there are 5

how many digits are there from 0 to 9 ?

there are 10

so you have 5 choices as the first digit, 5 choices again for the second digit, 10 choices for the 3rd digit, etc

- math30 -
**alejandro**, Monday, August 5, 2013 at 3:31pmThanks, but what about the odd number?

- math30 -
**Steve**, Monday, August 5, 2013 at 4:07pmlet's see. You know there are 10 digits

You know there are 5 even digits.

asking now how many odd digits there are is the same as holding out both hands, and when someone says, "This one is your left hand," you ask, well, which one is my right hand?

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