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Posted by **Gianina HELP HELP** on Tuesday, December 18, 2012 at 1:15am.

a) How many codes are possible if there are no restrictions?

b) What is the probability of someone entering a code at random and gaining entry to building?

- Algebra -
**Steve**, Tuesday, December 18, 2012 at 9:52amthere are 10^5 * 52 unique codes

there are 130 valid ones for access

so, it should be clear what p(access) is for random entry. Not high.

- Algebra -
**Nina PLEASE ALGEBRA**, Tuesday, December 18, 2012 at 5:52pmThank you but I don't understand why is 52 in the first question ;and what is exactly the answer to the question b)

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