1 votes 1 votes How many integers in the set {1,2,3,4,....121} are not divisible by 2 or 3 or 5? How will I determine in exam how many numbers are divisible by 3 or 2 & 3, 3 & 5, 2& 3 & 5? It will be time-consuming and confusing. Combinatory discrete-mathematics combinatory + – Gupta731 asked Oct 28, 2018 Gupta731 310 views answer comment Share Follow See all 4 Comments See all 4 4 Comments reply Mk Utkarsh commented Oct 28, 2018 reply Follow Share Use inclusion exclusion with 3 sets 0 votes 0 votes Gupta731 commented Oct 28, 2018 reply Follow Share Okay, I need to learn the concepts. Actually, I am weak in Combinatorics. 0 votes 0 votes smsubham commented Oct 28, 2018 reply Follow Share See this: https://gmatclub.com/forum/how-many-integers-from-1-to-100-are-not-divisible-by-2-3-and-187487.html 2 votes 2 votes Gupta731 commented Oct 28, 2018 reply Follow Share Thanks, that makes it quite easy. 0 votes 0 votes Please log in or register to add a comment.