$A$ pipe open at both ends and a pipe closed at one end have the same length. The ratio of the frequencies of their $P^{\text{th}}$ overtone is:

  • A
    $\frac{P+1}{2P}$
  • B
    $\frac{P+1}{2P+1}$
  • C
    $\frac{2(P+1)}{2P+1}$
  • D
    $\frac{P}{2P+1}$

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