IQ test, online IQ test, IQ
Xiao Li: 'Lao Zhang! You haven't told me your new phone number since you moved. It's not in the phone book. '
Lao Zhang: 'I really don't want to tell people my phone number. '
Xiao Li: 'well, I'll ask you 24 questions and you can answer me with yes or no. All right? "
Lao Zhang: "there are tens of millions of possible telephone numbers. Can you guess them from 24 questions? No problem, you can ask!"
Sure enough, Xiao Li only asked 24 questions to guess the seven digit telephone number of Lao Zhang's family!
Can you think of a way? Are you right?