Re: Practice question

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From	Ned Batchelder <ned@nedbatchelder.com>
Subject	Re: Practice question
Date	Sun, 05 Oct 2014 21:25:16 -0400
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On 10/5/14 8:07 PM, Seymore4Head wrote:
> On Sun, 05 Oct 2014 19:14:27 -0400, Ned Batchelder
> <ned@nedbatchelder.com> wrote:
>
>> On 10/5/14 7:02 PM, Seymore4Head wrote:
>>> For the record, I don't want a hint.  I want the answer.
>>> I see a practice question is similar to this.
>>> 15 <= x < 30  And it wants a similar expression that is equivalent.
>>> So the right answer is 15<= x or x <30
>>
>> No, "15 <= x < 30" is equivalent to "15 <= x and x < 30".
>>
>>> but one of the other answers is
>>> not (15<= x and x <30)
>>
>> You are speaking ambiguously.  Which did you mean:
>> a) one of the other answers isn't "15 <= x and x < 30", or:
>> b) one of the other answers is "not (15 <= x and x < 30)" ?
>
> Here is the exact question, I was trying to post something similar.  I
> failed.
>
> http://i.imgur.com/iUGh4xf.jpg
>

Why isn't the fourth one correct?

-- 
Ned Batchelder, http://nedbatchelder.com

Thread

Practice question Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-05 19:02 -0400
  Re: Practice question Roy Smith <roy@panix.com> - 2014-10-05 19:06 -0400
  Re: Practice question Ned Batchelder <ned@nedbatchelder.com> - 2014-10-05 19:14 -0400
    Re: Practice question Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-05 20:07 -0400
      Re: Practice question Ned Batchelder <ned@nedbatchelder.com> - 2014-10-05 21:25 -0400
      Re: Practice question Steven D'Aprano <steve@pearwood.info> - 2014-10-07 08:41 +0000
  Re: Practice question Skip Montanaro <skip.montanaro@gmail.com> - 2014-10-05 18:33 -0500
    Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-05 19:47 -0700
      Re: Practice question Skip Montanaro <skip.montanaro@gmail.com> - 2014-10-06 08:04 -0500
        Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-06 09:23 -0700
          Re: Practice question Chris Angelico <rosuav@gmail.com> - 2014-10-07 03:52 +1100
            Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-06 10:05 -0700
              Re: Practice question Chris Angelico <rosuav@gmail.com> - 2014-10-07 04:13 +1100
              Re: Practice question Steven D'Aprano <steve@pearwood.info> - 2014-10-06 20:49 +0000
                Re: Practice question "Redge @ Versalytics.com" <versalytics@gmail.com> - 2014-10-06 20:54 -0400
                Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-08 09:14 -0700
                Re: Practice question Chris Angelico <rosuav@gmail.com> - 2014-10-09 03:23 +1100
                Re: Practice question Skip Montanaro <skip.montanaro@gmail.com> - 2014-10-08 11:27 -0500
                Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-08 09:41 -0700
  Re: Practice question Terry Reedy <tjreedy@udel.edu> - 2014-10-05 19:47 -0400
    Re: Practice question Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-05 20:18 -0400
      Re: Practice question Steven D'Aprano <steve@pearwood.info> - 2014-10-07 08:48 +0000
        Re: Practice question C Smith <illusiontechniques@gmail.com> - 2014-10-07 05:43 -0700
  Re: Practice question C Smith <illusiontechniques@gmail.com> - 2014-10-05 16:24 -0700
  Re: Practice question Denis McMahon <denismfmcmahon@gmail.com> - 2014-10-07 01:46 +0000
    Re: Practice question Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-06 22:06 -0400
      Re: Practice question alister <alister.nospam.ware@ntlworld.com> - 2014-10-09 15:28 +0000

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