Question 23
Fifty students numbered 1 to 50 stand in a straight line. The first leaves, the second stays, the third leaves, the fourth stays, and so on. Repeat until only one student is left. What is that student’s number?
Interpretation: after each complete pass, start again at the front of the remaining line and remove its first student, retain its second, and so on. Preserve the order of those who remain.
Answer format: one whole number, without units. Leading zeros are optional; the printed answer sheet uses four digits.
Interpretation: after each complete pass, start again at the front of the remaining line and remove its first student, retain its second, and so on. Preserve the order of those who remain.
Answer format: one whole number, without units. Leading zeros are optional; the printed answer sheet uses four digits.