What is the next number in these sequences?
7, 14, 21, 28, 35 .....?
11, 11, 22, 66, 264 .....?
18, 108, 648, 3888 ....?
10, 15, 5, 25, 20 ......?
6, 12, 4, 8, 2.66 .....?
8, 20, 50, 125, .....?
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