In a family, there are three siblings: Akira, Kenji, and Hina. Their activities include practicing different musical instruments. Akira plays the piano, and Kenji plays the guitar. There is a recital where only two performers are set to play a duet. It is known that Hina cannot play the piano. Who cannot be part of the duet, and which instruments are played in the recital?
Provide a very brief response.
Hina cannot play the piano, so Akira, who plays the piano, cannot be part of the duet with Hina because their instruments don't match for a duet. Since only two performers can play, and Kenji plays the guitar, which doesn't have a restriction like the piano, the duet must be between Kenji and either Akira or Hina. However, since Hina cannot play the piano and there is no information suggesting Kenji can play the piano or Akira can play the guitar, the most reasonable assumption is that Kenji and Akira play the duet, with Kenji on the guitar and Akira on the piano. Hina, therefore, cannot be part of the duet, and the instruments played in the recital are the piano and guitar.