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

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2.
200, 196, 180, 116, _______

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3.
987, 878, _______, 660, 551, 442

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4.
2, 6, 14, _______, 62, 126

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5.
4, 8, 16, 32, 64, _______

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6.
3, 10, 20, 27, _______, 44

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7.
144, 121, 100, _______, 64, 49

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