In a study of senior CS majors, U.S. students are tops in skills

Post by m463 » Wed, Mar 20, 2019, 1:41 AM UTC

the_jeremy wrote: post #109

mywrathacademia wrote: post #101

Earlier quoted context omitted.

Thinking of the problem as a nested for loop it's intuitive to see how you get 1000 combinations without the numbers being unique but I dont see how to get 720 combinations as the answer when each digit is different. Can you explain where 720 combinations comes from in the context I mentioned?

for i = 1-10 for j = 1-10 if i == j break for k = 1-10 if i == j or i == k break log(i,j,k) (I don't understand HN formatting still)

    #!/usr/bin/python
    r = [(i,j,k) for i in range(10) for j in range(10) for k in range(10) if i!=j and i!=k and j!=k]
    print(len(r))

Post by zanny » Wed, Mar 20, 2019, 2:48 AM UTC

badpun wrote: post #123

ggggtez wrote: post #118

Earlier quoted context omitted.

I guess people will be blind to information that disagrees with them. They DO discuss it, it's right there at the end: >In every country, the men came out ahead; the gap overall was smallest in China, and biggest in the U.S. But if you are looking at a difference of between gender (0.4) and thinking you'd rather hear them talk about that than the difference between nationality ( double that at 0.8) then you clearly a…

During my CS studies, a considerable number of male students were computer geeks who were playing with computers pre-uni. Female students, OTOH, were 100% oblivious of any fundamental concepts (ex. what is programming). That could explain the disparity - they had a lot of catching up to do, esp. at the beginning.

Post by nickm12 » Wed, Mar 20, 2019, 5:11 AM UTC

bfrydl wrote: post #36

harias wrote: post #17

> Once the students were selected, the researchers then administered the Major Field Test in Computer Science, an exam that was developed by the U.S. Educational Testing Service and is regularly updated. There is a huge variation among countries in how subjects are taught and tested. I would like to add that many of my peers have resorted to streamlining for whiteboard interviews, and unsurprisingly, they end up with…

I took a look at the sample questions for the test, having never heard of it. It's 66 multiple choice questions, and many of them seem like “gotcha” questions where one of the answers is an off-by-one error or something like that. And how about this lovely question: > A personal identification number that opens a certain lock consists of a sequence of 3 DIFFERENT digits from 0 though 9, inclusive. How many possible P…

Post by edflsafoiewq » Wed, Mar 20, 2019, 8:44 AM UTC

killaken2000 wrote: post #91

newman8r wrote: post #44

Earlier quoted context omitted.

Funny. Yeah I totally would have missed the word "different"... does such a lock even exist in the real world?

I would prefer it be more explicit and say, "each digit can only be used once". Different can be interpreted in multiple ways. Reminds me of a physics test where the question is something like: Susie is almost at her house and comes to a stop in 4 seconds. What was her acceleration.

Post by somehnreader » Wed, Mar 20, 2019, 9:02 AM UTC

mooreds wrote: post #102

mywrathacademia wrote: post #101

Earlier quoted context omitted.

Thinking of the problem as a nested for loop it's intuitive to see how you get 1000 combinations without the numbers being unique but I dont see how to get 720 combinations as the answer when each digit is different. Can you explain where 720 combinations comes from in the context I mentioned?

10 * 9 * 8 The first time you pick, you have 10 different numbers to choose from, the second time, 9, the third time 8.