If her number is 2 she won't know, because if yours is 0 it won't be but if it's 1 it would be. If her number is 1 then adding either 1 or 0 won't make it greater than 2. The person can only answer "Yes" "no" or "I don't know" and must do so honestly. You can't ask "what's the number" because that's an invalid question within the constructs of the riddle. This answer is in the spirit of the question while that one uses a trick of language to contrive an answer.
The riddle says you may ask one question, it does not state that you can ask a question dependent on a statement. Show 12 more comments. Add a comment. Here's an example question using this method. A yes-no question is characterized by the question word, not by the answer.
So you shouldn't use question words "what, when, where, why, who, or how". One way to know if your answer works is to ensure that it stilll works if she decides to answer one of "affirmative", "negative", "absolutely", "of course", "I can't tell" etc.
That said, the question does state, The girl can only answer "Yes", "No" or "I don't know" , and does not make any restrictions about what those responses have to mean. I should read it more carefully next time. Is the result a fraction? Great answer. The correct answer in the 1 case is "I can't do that. The denominator is 1 in lowest terms, but it's still a fraction. He should ask "Is the number an integer? And if you say "Is the resulting real number a fraction? It does not mean: "We don't know".
The real numbers, without zero, are a multiplicative group. We don't do this because we haven't yet figured out how to find a multiplicative inverse of zero. It's not an unsolved problem. Show 4 more comments. Grimm The Opiner. Show 3 more comments. This must surely be a contender This is a good one.
I think it's correct now. I will ask my wife and kids. Yes, 2. No, 3. I don't know", which word would your number point to? Show 2 more comments. Brian M. What if the girl's own as-yet-unpublished research has decided the Odd Perfect Number issue? Of course, it's also possible that the girl had just measured TonyK's brother's height as part of an anatomical statistics study, so his question isn't necessarily fool-proof, either.
Scott - What if there's an odd perfect number? Yep, it's a boring answer, but it always works for such kind of problems. If the girl's number is 2, then her answer is "I don't know".
If the girls' number is 1, then her answer is "no". So the number of real roots can be either equal or less than her number. Hence she just can answer "I don't know". Glen O. For this to work you have to say: "I'm thinking of a function with a point x,y where the derivative is two less than your number.
Is that point a local minimum? Hence her answer would be "I don't know". If you don't say otherwise, it's assumed that free variables in an expression in this case, the variable being "a function" are universally quantified, not assigned to unknown values. Love Our Lesson Plans? By signing up, you are agreeing to Master The Curriculum Terms and Conditions, confirming that you have read our Privacy Policy and to receiving helpful educational materials, updates and support by email.
This field is for validation purposes and should be left unchanged. Our Blog. Join for Free Subscribe today for access to all of our free resources. You can change an individual question number by clicking on the number and editing within the text box that appears. Note that, in almost all cases, question numbers do not need to be unique, and you can use both letters and numbers. In that case, duplicates will not export. This feature sequentially orders all the question numbers in your survey at once.
Note the just question numbers are changed; questions themselves are not moved. By default, question numbers are not seen by respondents; instead, they are used to identify your questions when you are reviewing your downloaded data or referencing questions within the Qualtrics platform. If desired, you can display the question numbers to respondents as they are taking the survey. Simply open your survey options and enable Question numbers.
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To begin formatting a question, click on it in the survey builder. Matrix table questions allow you to combine multiple questions with the same answers.
This is most useful when you need to ask multiple questions that should be rated on the same scale. Sometimes you need to randomize the order of questions in a block. With question randomization, you can do just that—and so much more.
Some common options include:. The side by side question allows you to ask multiple questions in one condensed table. You can choose from three slider question types: bars, sliders, and stars.
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