Trong một buổi thi hát, thí sinh phải hát một bài hát có nói về mùa xuân hoặc mùa hè. Có \(
15
\) bài hát về mùa xuân và 12 bài hát về mùa hè. Hỏi thí sinh có bao nhiêu cách chọn, biết rằng trong các bài hát, không có bài nào nói về cả hai mùa xuân, hè.
Áp dụng quy tắc cộng ta có: \(
15+12=27
\) cách chọn.

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