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

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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.
500, 475, 425, 350, 250, _______

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6.
200, 196, 180, 116, _______

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7.
987, 878, _______, 660, 551, 442

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