- "Which number" is used to ask about a specific number, while "what number" is used to ask about any number in general.
- "Which number" implies that there are multiple possible options, whereas "what number" does not have this connotation.
- "Which number" requires some previous context or information, whereas "what number" does not necessarily need any prior knowledge.

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Which number

- "Which number" refers to a specific number in a set or sequence.
- It is used to inquire about a particular number that has already been identified or implied.
- This phrase is often used when there are multiple possible options to choose from.

What number

- "What number" is more general and refers to any number in a set or sequence.
- It is used to ask for a number in a general sense, without referring to a specific option or context.
- This phrase is often used when the speaker is unsure of what number is being referred to.

Which number

4,520,000 results on the web

Examples

- Which number do you think is the winning lottery number?
- Can you tell me which number in this sequence is the odd one out?
- I'm not sure which number to choose for my password.

More popular

What number

9,490,000 results on the web

Examples

- What number did you say is your favorite?
- What number do I need to call for customer service?
- I can't remember what number I picked for my luggage combination.

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