100 people standing in a circle in an order 1 to 100

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100 people standing in a circle in an order 1 to 100.
No.1 has a sword.
He kills next person (i.e.no. 2 )and gives sword to next to next (i.e no.3).
All person does the same until only 1 survives.
Which number survives at the last?

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73 is the Answer