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.)
+129847 Assuming the first digit isn't 0 .......
Number of 5 digit integers = (99999 - 10000 + 1) = 90000
P( remembering) = 1 / 90000
Incorrect .......the answer should be
10 * 9 * 8 * 7 * 6 = 30,240
P (remembering ) = 1 /30240
THX to EP for pointing out my silly error ( he assumes that the combo CAN start with 0 )
