Three sound waves of equal amplitudes have frequencies \( (n-1), n,...

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Three sound waves of equal amplitudes have frequencies \( (n-1), n,(n+1) \). They superimpose to give beats. The
\( \mathrm{P} \) number of beats produced per second will be
[AIEEE 2009, NEET (Phase-II) 2016]
W
(a) 1
(b) 4
(c) 3
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