Antony Johnson works in the human resources department of a small wholesale company. His boss has delegated to Johnson the job o
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If everybody at a company is assigned a unique 8-digit id, then 3628800 unique IDs exist.
<h3>What is a unique ID?</h3>- Any document that can be used to prove a person's identity (also known as ID or paper) is considered an identity document.
- It is commonly referred to as an identity card (IC, ID card, citizen card), or passport card when issued in the form of a small, standard credit card.
- Some countries issue formal identity documents, such as national identification cards, which may be required or optional, whereas others may require identity verification via regional identification or informal documents.
- A photo ID is a form of identification that includes a person's photograph.
To find out the number of unique IDs:
- Given, assigned unique id= 9 digits.
- Unique numbers= 1,2,3,4,5,6,7,8,9,0
Then,
- n = 10
- unique number: r = 9 digits
Using formula:
Therefore, if everybody at a company is assigned a unique 8-digit id, then 3628800 unique IDs exist.
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The correct question is given below:
Everybody at a company is assigned a unique 9-digit ID. How many unique IDs exist? (note: you should also count the id consisting of all zeros)