Multiple select questions

I'm interested to know how many people list the number of correct answers in their multiple select questions. 

eg (select the 2 correct answers) 

Would you see this as simplifying the question so that the students have a higher chance of getting it right, or, do you think in cases where multiple attempts are permitted on the same question that you use the feedback given as a learning opportunity and therefore not list the number of correct answers? 

In addition, if there are 3 correct answers would you ever just provide 3 answers and not give any instruction on how many right answers there should be, or would you write a 4th answer that was incorrect just so there was a wrong option?

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