Charlene has 12 plastic cups. of the 12 plastic cups,3 were green,4 are red, and 5 are blue. she stacks the cups into a single stack in random order. what is the probability that the cups on top of the stack is not green

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?