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What is the next number in the series?

15 29 56 108 208 ?




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Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

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Why is a river so rich ?

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On the vault, a text is written as:

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21 25
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Minutes later he deciphers the code.

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We know following clues:
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There's a day, that comes around once a year.
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No Solution

In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki