Of all the eighth graders at the Paxton School, 15 played basketball, 9 played volleyball, 10 played soccer, 1 played basket
ball and soccer only, 2 played volleyball and soccer only, 1 played basketball and volleyball only, and 2 played volleyball, basketball, and soccer. How many played one or more of the three sports?
- the number of green blocks which is equal to the number of favourable events - the number of all blocks, which is equal to the number of all possible outcomes
