Any help would be appreciated...I'm rather stuck!
It's a mock exam and annoyingly they provided no solutions for me to work from...grrr....
Thank-you
So i would have to go through and write all the numbers out basically?
I don't see the point of that using the inclusion-exclusion theorm...arg...this is the annoying thing about not having the solutions...don't know how they want us to do it...
Thankyou for your reply Plato
EDIT: WAIT NEVER MIND I GET IT NOW!! Silly me was thinking it was the actual numbers, rather than how many were in the set!
Thankyou!!
The answer is clear:
$\displaystyle \left\lfloor {\frac{{50}}
{2}} \right\rfloor + \left\lfloor {\frac{{50}}
{3}} \right\rfloor + \left\lfloor {\frac{{50}}
{5}} \right\rfloor - \left\lfloor {\frac{{50}}
{6}} \right\rfloor - \left\lfloor {\frac{{50}}
{{10}}} \right\rfloor - \left\lfloor {\frac{{50}}
{{15}}} \right\rfloor + \left\lfloor {\frac{{50}}
{{30}}} \right\rfloor $
That is using the inclusion-exclusion.