M&M’s The Mars company says that before the introduction of purple, yellow candies made up 20% of their plain M&M’s, red another 20%, and orange, blue, and green each made up 10%. The rest were brown....

M&M’s The Mars company says that before the introduction of purple, yellow candies made up 20% of their plain M&M’s, red another 20%, and orange, blue, and green each made up 10%. The rest were brown.

 a) If you pick an M&M at random, what is the probability that

1. it is brown?

2. it is yellow or orange?

3. it is not green?

4. it is striped?

 b) If you pick three M&M’s in a row, what is the probability that

1. they are all brown?

2. the third one is the first one that’s red?

3. none are yellow?

4. at least one is green?