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1,3, 5 , 7, 15 , 21 ,35,105
b)
1,3, 7 , 11, 21 , 33 , 77 ,231
c)
1, 2 , 3 , 5 , 7 , 6 , 10 , 14 ,15 , 21 , 35 , 30 , 42, 70, 210