500 people standing in a circle in an order 1 to 500. No. 2 has a sword. He kills the next person (i.e. No. 3) and gives the sword to the next (i.e. No. 4). All people do the same until only 1 survives. Which number survives at the last?
There are 500 people starting from 1 to 500.
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the answer is 490
the person with number 490 will survive at last
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