Pregunta: Dados los siguientes grupos de fracciones, decir de cada fracción si es irreductible o no:1) ${2}/{1}$  y ${9}/{3}$  y ${9}/{7}$  
2) ${8}/{2}$  y ${4}/{7}$  y ${6}/{14}$  
3) ${7}/{6}$  y ${27}/{12}$  y ${16}/{28}$  
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