Random display a subset of question library

[dmtk41]

Hi forum,
My case is that I want to create a 20 questions examination. These 20 questions are randomly taken from a library of 100 questions.
Is there a way to random display a subset of question library?

[yanokwa]

If you search on the forum, you can find a few approaches to solving this problem. Try them!

• Randomization of questions - #4 by yanokwa
• Randomize order of questions - #10 by Mehrab_Ali

[Xiphware]

@dmtk41

These 20 questions are randomly taken from a library of 100 questions.

Just to be sure, in addition to being randomly selected, do the questions also have to be randomly presented/sorted? (this additional constraint may affect possible solutions...).

[dmtk41]

Thank you @Yaw, @Xiphware
The Randomization of questions - #4 by yanokwa is close to the approach that I'm looking for. I did read this topic before but I stuck at preventing the random function generate duplicate number so potentially specific question maybe appear several times. Pls see my attached form.sample.xlsx (14.8 KB)
I found this thread about de-duplicate but look like it not work.

Random number without duplicates/without replacement

Dear all, I need to sample 20 households based on a household list. I was thinking I could sample them using ODK and the household rank number. Hence, I was looking for a way to generate 20 random numbers on ODK. I did the following 1+int(once(random())*${total number of households in the village}) but this give me a random number with replacement and hence possibly with duplicates. I am looking to a way to do the same without replacement. Any idea? Thanks

The Randomization of questions - #4 by yanokwa and randomly presented/sorted is also interesting me and I'm looking at them. I think I need it.