Question: Random Number Drew writes down a number between 1 and 2 0 0 . Mary must determine that number by asking yes / no

Random Number
Drew writes down a number between 1 and 200. Mary must determine that number by asking "yes/no" questions of Drew. Mary knows that Drew always tells the truth. If Mary uses an optimal strategy, how many questions will she need to determine the number in the worst case scenario?
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16
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 Random Number Drew writes down a number between 1 and 200.

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