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1.5/6,4/8,3/4,1/5=5/6,1/2,3/4,1/5 then LCM of6,24,and5 is 60 so common dr is 60                       2.2/8,3/10,1/2,3/5=   1/4,3/10,1/2,3/5 then LCM of4,10,2,5 is20                                                     3.1/5,1/12,1/2,1/7  common dr is420                                                                                              4.1/8,2/6;8/4,1/7=1/8;1/3,2/1,1/7    common dr is168                                          
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