@Wladimir : you have to use  formula given in below link....

http://en.wikipedia.org/wiki/Inclusion%E2%80%93exclusion_principle

On Fri, Sep 28, 2012 at 12:26 AM, Wladimir Tavares <[email protected]>wrote:

> what happens when a = 3, d = 5
> a, a + d, d +2, a +3 d = 3,8,13,18?
>
> Wladimir Araujo Tavares
> *Federal University of CearĂ¡ <http://lia.ufc.br/%7Ewladimir/>
> Homepage <http://lia.ufc.br/%7Ewladimir/> | 
> Maratona<https://sites.google.com/site/quixadamaratona/>|
> *
>
>
>
>
>
> On Thu, Sep 27, 2012 at 8:57 AM, atul anand <[email protected]>wrote:
>
>> @ashish : here is the generalized equation....
>> http://en.wikipedia.org/wiki/Inclusion%E2%80%93exclusion_principle
>>
>> note : you need to take LCM of a,a+d,a+2d etc etc........whenever you are
>> dividing to find count
>>
>> On Thu, Sep 27, 2012 at 2:55 AM, ashish pant <[email protected]>wrote:
>>
>>> thanks for your reply.. actually i was thinking the same thing.. but I
>>> am facing problems in finding the unique multiples  of a+3d and a+4d as
>>> applying inclusion exclusion principle in this way is getting too difficult
>>> due to large no of factors to be added and subtracted.. is der any other
>>> approach or any way to simplify the process..
>>>
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