10 The number lock of a suitcase has wheels, each labelled with ten digits i.e., from to . The lock opens with a sequence of four digits with no repeats. What is the probability of a person getting the right sequence to open the suitcase?
Given, Each wheel can be labelled with 10 digits.
Number of ways of selecting 4 different digits out of the 10 digits =
These 4 digits can arranged among themselves is ways.
Number of four digit numbers without repetitions =
Number of combination that can open the suitcase = 1
Required probability of getting the right sequence to open the suitcase =