25 tuning forks are arranged in series in the order of decreasing f...

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25 tuning forks are arranged in series in the order of decreasing frequency. Any two successive forks produce 3
\( \mathrm{P} \) beats/sec. If the frequency of the first turning fork is the octave of the last fork, then the frequency of the \( 21^{\text {st }} \) fork is
W
[Kerala (Engg.) 2001]
(a) \( 72 \mathrm{~Hz} \)
(b) \( 288 \mathrm{~Hz} \)
(c) \( 84 \mathrm{~Hz} \)
(d) \( 87 \mathrm{~Hz} \)
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