I'm not sure if these are actually true counting/probability ones, it's just I don't understand them.
- Kim has red, blue, grey, orange, yellow, and white paints. If she picks 3 in a painting but never uses red and blue together, how many combinations can she have?
- Professor Stashe awarded 500 certificates, for math and science. Girls won 2/3 of the math and 1/2 of the science certificates. If the number of girls who won for math was 50 more than 3/2 the number of girls who won for science, how many girls won for math?
- The sequence 72, 75, 76, 81, 84, 85... in which each number is 9 more than the number 3 numbers before it, includes (694, 733, 812, 950)