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 2 years ago
To use a school copier, a 4 digit code using the digits 09 must be entered. If each code cannot begin with the number 0 and there are 81 acceptable codes, what is the probability that someone will randomly select a usable code?
 2 years ago
To use a school copier, a 4 digit code using the digits 09 must be entered. If each code cannot begin with the number 0 and there are 81 acceptable codes, what is the probability that someone will randomly select a usable code?

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philips13
 2 years ago
Best ResponseYou've already chosen the best response.1how many four digit numbers are there?

philips13
 2 years ago
Best ResponseYou've already chosen the best response.1number acceptable  will be the answer total number

philips13
 2 years ago
Best ResponseYou've already chosen the best response.1sure it does... use four digits, 0 to 9.... how many possible codes are there?

philips13
 2 years ago
Best ResponseYou've already chosen the best response.1let's see... 0000 0001 0002 0003 0004 ... 9999 so there are how many possible codes?

philips13
 2 years ago
Best ResponseYou've already chosen the best response.1that looks right to me

philips13
 2 years ago
Best ResponseYou've already chosen the best response.1probability questions usually boil down to number of good ways / number of all the ways
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