Question 370070
Look at the number of integers from 1 to 3278 divisible by 12.
{{{N(12)=273}}}
Look at the number of integers from 1 to 3278 divisible by 15.
{{{N(15)=218}}}
Look at the number of integers from 1 to 3278 divisible by both 12 and 15(multiples of 60).
{{{N(12,15)=54}}}
Then find the number divisible by 12 and 15. 
{{{N=273+218-54}}}
{{{N=437}}}
So then the remaining integers from 1 to 3278 are not divisble by 12 or 15.
{{{N[t]=3278-437}}}
{{{highlight(N[t]=2841)}}}