Find the missing number

Find the missing number in the sequence below:

Find the missing number




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In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
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Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

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Which fur should we be getting from the Lion?

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A professor thinks of two consecutive numbers between 1 and 10.
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A: I do not know your number.
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A: Now I know.

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