On Wed, 20 Nov 2013 14:49:59 +0000, Alister wrote: > On Wed, 20 Nov 2013 13:57:30 +0000, Mark Lawrence wrote: > >> On 20/11/2013 09:29, Alister wrote: >>> On Wed, 20 Nov 2013 00:54:28 -0500, Dave Angel wrote: >>> >>>> On 20 Nov 2013 03:52:10 GMT, Steven D'Aprano <st...@pearwood.info> >>>> wrote: >>>>> 2 does count because it isn't divisible by 3. The question states, >>>>> "[count] how many positive integers less than N are not divisible >>>> by 2,3 >>>>> or 5". Two is not divisible by 3, so "not divisible by 2,3 or 5" is >>>> true, >>>>> so two gets counted. >>>> >>>>> The first number which is divisible by *all* of 2, 3 and 5 (i.e. >>>> fails >>>>> the test, and therefore doesn't get counted) is 30. The next few >>>> that >>>>> fail the test are 60, 90, 120, 150, 180, 210, 240, 270, 300, ... >>>>> Remember, these are the numbers which should not be counted. >>>> >>>>>> I count 1, not 6 >>>> >>>>> Out of curiosity, which number did you count? >>>> >>>> 1 of course. It's the only one that's not divisible by any of the >>>> factors. >>>> >>>> Apparently we disagree about precedence and associativity in English. >>>> I believe the not applies to the result of (divisible by 2, 3, or 5), >>>> so I'd count 1, 7, 11, 13, 17, 19, 23. The first nonprime would be >>>> 49. >>>> >>>> If I were trying to get the series you describe, I'd phrase it as >>>> "Not divisible by 2, and not divisible by 3, and not divisible by >>>> 5" >>> >>> This ambiguity is a great example of why teachers (and enayone else >>> responsible for specifying a programming project) should take greater >>> care when specifying tasks. >>> if it is to late to ask for clarification (the correct step in a real >>> world case) I suggest you write 2 programs 1 for each interpretation, >>> it will be good for your personal learning even if the teacher does >>> not give any extra credit. >>> >>> >> Ambiguity is the reason that some of the most expensive language >> lessons in the world are at places like Sandhurst and West Point. >> Giving crystal clear orders, whether verbally or in writing, is >> considered quite important in the military. >> >> By the way, this is double posted and there were four identical >> messages from you yesterday, finger trouble or what? :) > > I don't think the problem is at my end. I am only sending once to the > best of my knowledge (using Pan newsreader to Comp.lang.python)
Ok this is now silly Apologies to everyone I am monitoring my network connection to confirm that i am not sending multiple times. -- T-1's congested due to porn traffic to the news server. -- https://mail.python.org/mailman/listinfo/python-list