The number lock of a suitcase has 4 wheels, each labelled with ten digits i.e., from 0 to 9. 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?

Explanation

To solve the problem of finding the probability of a person getting the right sequence to open the suitcase lock, we will follow these steps:

### Step 1: Understand the Problem
The suitcase lock has 4 wheels, each labeled with digits from 0 to 9. The lock opens with a unique sequence of 4 digits with no repeats.

### Step 2: Determine the Favorable Outcomes (NA)
The favorable outcome (NA) is the one specific sequence that will open the lock. Since there is only one correct sequence, we have:
\[ NA = 1 \]
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