The number look of a suitcase has 4 wheels, each labeled with ten digits i.e. from 0 to 9. The lock will 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?
Number of all possible sequences
∴ Number of sequences of 4 distinct digits = 10 x 9 x 8 x 7 = 5040
∴ Required probability = 1/5040
(Numerator = 1, because the suitcase open for only one right sequence.)
