Question

To use a school copier, a 4- digit code using the digits 0-9 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?

Answer 1

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

Answer 2

how many four digit numbers are there?

Answer 3

does not say

Answer 4

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

Answer 5

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

Answer 6

i got one

Answer 7

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

Answer 8

when u divide

Answer 9

81/10,000

Answer 10

that looks right to me

Answer 11

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

Answer 12

thank you