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Asked by Mohit Last Modified
Answer 
Nurullmobeen
The number lock has 4 wheels, each labelled with ten digits i.e., from 0 to 9.
Number of ways of selecting 4 different digits out of the 10 digits =
Now, each combination of 4 different digits can be arranged in 
ways.
∴Number of four digits with no repetitions =
There is only one number that can open the suitcase.
Thus, the required probability is
.
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