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1969 AMC 12 Question 3

AMC12 · 1969 AMC 12

Question 3

If $N,$ written in base $2,$ is $11000,$ the integer immediately preceding $N,$ written in base $2,$ is:
  1. $10001$
  2. $10010$
  3. $10011$
  4. $10110$
  5. $10111$