Question

A trade development board organized conventions abroad for its 150 members in its jewelry industry. The conventions fell under 3 categories trading manufacturing and design. 52 attended the trading, 46 manufacturing and 32 the design. 20 attended the trading and manufacturing, 18 the trading and design, 8 attended the manufacturing and design but not the trading category, 14 attended the trading and manufacturing but not the design. draw a Venn diagram to illustrate the above information and find the numbers of who attended
1) none of the conventions
2) at least two convention
3) all three