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On other days, I often see two colors in front of my eyes - blue and yellow. I feel sad about what is happening. That is why I have a role for you today about colors. I have 5 markers in my pencil case: blue, yellow, green, red, and purple. How many ways can I put them in my pencil case if blue and yellow must always be together (in this order)?
Correct answer:
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You need to know the following knowledge to solve this word math problem:
combinatoricsbasic functionsGrade of the word problem
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