Pregunta: Dados los siguientes grupos de fracciones, decir de cada fracción si es irreductible o no:1) ${6}/{30}$  y ${9}/{3}$  y ${6}/{6}$  
2) ${4}/{9}$  y ${2}/{1}$  y ${2}/{4}$  
3) ${2}/{5}$  y ${15}/{9}$  y ${8}/{9}$  
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