Two sitar strings, A and B, playing the note Dha are slightly out of tune and produce beats of \...

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Two sitar strings, A and B, playing the note Dha are slightly out of tune and produce beats of
\( \mathrm{P} \) frequency \( 5 \mathrm{~Hz} \). The tension of the string \( \mathrm{B} \) is

W slightly increased and the beat frequency is found to decrease by \( 3 \mathrm{~Hz} \). If the frequency of \( \mathrm{A} \) is 425 \( \mathrm{Hz} \), the original frequency of \( \mathrm{B} \) is :-
(1) \( 430 \mathrm{~Hz} \)
(2) \( 420 \mathrm{~Hz} \)
(3) \( 428 \mathrm{~Hz} \)
(4) \( 422 \mathrm{~Hz} \)
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