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\(\frac{1}{81}\)??

how many four digit numbers are there?

does not say

number acceptable
---------------- will be the answer
total number

sure it does... use four digits, 0 to 9.... how many possible codes are there?

i got one

let's see... 0000 0001 0002 0003 0004 ... 9999
so there are how many possible codes?

when u divide

81/10,000

that looks right to me

probability questions usually boil down to
number of good ways / number of all the ways

thank you