IQ Tests : Number Sequences I - Fill in the blanks

IQ Tests in Logical Thinking : Number Sequences I

What number comes in the blank in each sequence below?

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1.
2.5, 3.75, _______, 8.4375, 12.65625

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2.
4, 8, 16, 32, 64, _______

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3.
213, 426, _______, 852, 1065, 1278

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4.
2, 3, 5, 7, 11, 13, 17, 19, _______

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5.
_______, 0.99, 9.9, 99, 990, 9900

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6.
987, 878, _______, 660, 551, 442

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7.
1/24, _______, 7/18, 10/15, 13/12, 16/9

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