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,

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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?