+0  
 
0
32
3
avatar

You cannot remember your 5-digit bike-lock combination, but you remember that all the digits are different. What is the probability that you guess the combination correctly? (Enter your probability as a fraction.)

 Jan 7, 2021
 #1
avatar
0

Solution 1. 5÷10000 = 0.0005= 1/2000 

Solution 2. 5÷99999 = 0.000050000500005= 10000100001/20000000000000

not sure which one it is...... Can somebody please check me......?

( I think solution to makes more sense because if it's a 5 digit lock combination and all the highest possible numbers to have would be 99,99, the highest possible numbers to have would be 99,999 and there are five digit, so you would 99999÷5 

-Grace

 Jan 7, 2021
 #2
avatar+289 
0

If the combination  can't start with  0

 

1 / [ 9 * 10^4 ]   =   1 / 90000

 

If  it can start with 0

 

1 / 10^5     =   1 / 100,000

 Jan 7, 2021
 #3
avatar
0

Since all of the digits have to de DIFFERENT:

1st digit   10 choices

   2nd digit 9 choices

     3rd digit 8 choices

         4nd digit 7 choices

            5st digit  6 choices

 

1 in ( 10 * 9 * 8 * 7 * 6 ) =    1/ 30240 

 Jan 7, 2021

39 Online Users

avatar
avatar
avatar
avatar