# Question: Sixty percent of the students at a certain school wear

Sixty percent of the students at a certain school wear neither a ring nor a necklace. Twenty percent wear a ring and 30 percent wear a necklace. If one of the students is chosen randomly, what is the probability that this student is wearing

(a) A ring or a necklace?

(b) A ring and a necklace?

(a) A ring or a necklace?

(b) A ring and a necklace?

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