I think the Question is "What is the minimum number to find out for certain what someones phone number is (a nine digit phone number)?"
If Yes thenIs your Phone number less than 500 000 000?If Yes thenIs your phone number greater than 250 000 000?etcIs your phone number greater than 375 000 000?
The minimium number to ask to find out what it is is then 30. (I think its supposed to be 32 but my calculator says 30)
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