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Figures shows the vibrations of four air...

Figures shows the vibrations of four air column. The ratio of frequencies `n_(p):n_(q):n_(r):n_(s)` is

A

`12:6:3:4`

B

`1:2:4:3`

C

`4:2:3:1`

D

`4:3:2:1`

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The correct Answer is:
B
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