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No direct evaluation (Posted on 2015-06-09) Difficulty: 2 of 5
Given that 2^29 is a nine-digit number all of whose digits are distinct, determine which of the ten digits is missing.
Provide your answer without computing the actual number.

Source: SMO contest

No Solution Yet Submitted by Ady TZIDON    
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re(3): Solution Comment 4 of 4 |
(In reply to re(2): Solution by Jer)

lol, yeah, didn't think of the power of 2 thing.  When I read proofs/solutions I tend to see the logic/reasoning in my head in a much more general manner and thus some of the obvious assumptions like that get lost to me.
  Posted by Daniel on 2015-06-09 13:33:51

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