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

Hint

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2.
1/4, 0, 1, -3, 13, -51, 205, _______

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3.
2, 6, 12, 20, 30, 42, 56, _______

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4.
9, 729, 8, _______, 7, 343

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5.
1, 2, 10, 37, 101, _______

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6.
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, _______

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7.
6, 24, 60, 120, _______, 336, 504, 720

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