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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?

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Number of wheels in number lock of suitcase .

Now, first wheel can have any one of the tens digits from to .
Since, repetition is not allowed, so second wheel can have any of the remaining digits.
Similarly, third wheel can have any of the remaining digits.
And fourth wheel can have any of the remaining digits
So, number of four digit lock code that can be formed without repetition of digits  
So, total four digit numbers formed
But since, the lock can open with only one of the all four digit numbers.
Hence, required probability
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Question Text
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?
Answer TypeText solution:1
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