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You are choosing a student council president by lots.. If you have 10 pieces of...

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You are choosing a student council president by lots.. If you have 10 pieces of paper numbered 0-9 and you draw 2 pieces (where order does NOT matter), how many candidates can get a unique number sequence?a. 90b. 45c. 60d. 30

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You are choosing a student council president by lots.. If you have 10 pieces of paper numbered 0-9 and you draw 2 pieces (where order does NOT matter), how many candidates can get a unique number sequence?a. 90b. 45c. 60d. 30

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