IQ Tests : Number Sequences II - Fill in the blanks

IQ Tests in Logical Thinking : Number Sequences II

What number comes next in each sequence below?

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1.
15, 12, 24, 20, 33, 28, 42, _______

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2.
1, 2, 6, 24, 120, _______

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3.
0, 1, 2, 7, 20, 61, 182, _______

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4.
1/12, 1/2, 9/8, 13/6, 17/4, _______

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5.
1, 3, 7, 15, 31, 63, 127, _______

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6.
6, 24, 60, 120, _______, 336, 504, 720

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7.
361, 289, _______, 169, 121

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