a). 9, 14, 19, 23, 27, 31, 35
b). 7, 13, 19, 25, 31, 37, 43
c). 11, 21, 31, 41, 51, 61, 71
d). 6, 14, 22, 30, 39, 48, 57
e). 12, 15, 18, 21 24, 27, 30
f). 2, 4, 8, 16, 25, 33, 41, 49
g). 3, 33, 63,93 , 103, 203, 303
h). 50, 100, 150, 250, 350, 450,550
i). 11, 22, 33, 44, 55,66 , 77
j). 18, 36, 54,66 ,74 ,86 , 94
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