25 tuning forks are arranged in series in the order of decreasing frequency. Any two successve fork produces 3 beats/s.

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25 tuning forks are arranged in series in the order of decreasing frequency. Any two successve fork produces 3 beats/s. If the frequency of the first tuning fork is the octave of the last fork, then the frequency of 21st tuning fork is
1) 72 Hz 2) 288 Hz 3) 84 Hz 4) 87 Hz

25 Tuning Forks Are Arranged In Series In The Order Of Decreasing Frequency Any Two Successve Fork Produces 3 Beats S 1 (138.37 KiB) Viewed 45 times

25 Tuning Forks Are Arranged In Series In The Order Of Decreasing Frequency Any Two Successve Fork Produces 3 Beats S 2 (384.04 KiB) Viewed 45 times

25 Tuning Forks Are Arranged In Series In The Order Of Decreasing Frequency Any Two Successve Fork Produces 3 Beats S 3 (173.15 KiB) Viewed 45 times

I have also tried but ends up cancelling the f at the end so can't get the answer, please help me with this thanks, and sorry for the messy work
1.25 tuning forks are arranged in series in the order of decreasing frequency. Any two successive fork produces 3 beats/s. If the frequency of the first tuning fork is the octave of the last fork, then the frequency of 21st tuning fork is (1) 72 Hz (2) 288 Hz (3) 84 Hz (4) 87 Hz ma taneinn 101 N and an

وا 22nd 2b 21st 1 w 2nd Ist | 2 - ل - م 1 3 + 20 - و 2+3 - 2 3 - 20 - ط 14- 21 = 3 3+ ه ا - ا = ا د وداع -

Camino Ist 22nd Octave e 2nd 21st ochaine 9 266-3) = -3 + 26. 1621-622) 3 2-3 +2) =3 746-31 :3 - 46-3 = 3 or 48-3 = -3 wa - 3+ 26 -13th