4. It is your little brother's birthday, and he has invited 5 of his friends to come to his party. In each of the following situations, how many ways are there for his friends to line up for a photograph if your brother wants to stand next to at least one of his friends who is wearing a green shirt? Evaluate and find the final answer to each question. a. 2 of his friends are wearing green shirts? b. 3 of his friends are wearing green shirts?

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