Pregunta: Dados los siguientes grupos de fracciones, decir de cada fracción si es irreductible o no:1) ${7}/{4}$  y ${27}/{15}$  y ${40}/{48}$  
2) ${7}/{4}$  y ${1}/{2}$  y ${1}/{6}$  
3) ${3}/{7}$  y ${4}/{24}$  y ${20}/{4}$  
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