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a) 6 10, 15, 14
bo 2*3=6 , 2*5 =10 , 3*5 =15, 2*7=14
b) 30, 42, 66, 78
bo 2*3*5=30 , 2*3*7 =42 , 2*3*11 =66, 2*3*13=78
c) 210, 330, 390, 510
bo 2*3*5*7=210 , 2*3*5*11=330 , 2*3*5*13=390, 2*3*5*117=510