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When using the word "which" is it necessary to still use "one" after asking a question or do "which" and "which one" have the same meaning? Where do you draw the line on the difference between "which" and "which one" when asking a question that involves more than one answer?

Example:

How much is 1 + 1?

Which (one) is the right answer?:

A. 2

B. 11

  • Why do you say "still"? How is it different if it's not a question? Can you give an example of any sentence where which has to be followed by one? – Jason Bassford Aug 12 '19 at 5:25
  • Sometimes there's more than one. Out of the five following statements, which two are correct?. – Smock Aug 12 '19 at 8:44
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When using the word "which" is it necessary to still use "one" after asking a question?

Generally no. You may optionally add "one" or not.

do "which" and "which one" have the same meaning?

Generally yes. An exception could be if you are seeking multiple answers.

"Sometimes there's more than one. Out of the five following statements, which two are correct?" – Smock

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