Finding a Truth-Teller

Logic Level 5

There are 69 people in a room, of which 42 are truth-tellers (they always tell the truth) and the rest are liars (they can lie or tell the truth).

You are allowed to ask any person A whether any person B (other than person A) is a liar or not. What is the minimum number of questions needed to ensure that you can correctly identify at least one truth-teller?

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