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

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2.
200, 196, 180, 116, _______

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3.
243, 162, 108, 72, _______, 32

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4.
213, 426, _______, 852, 1065, 1278

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

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6.
_______, 0.99, 9.9, 99, 990, 9900

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7.
1, 3, 6, 10, 15, _______

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