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You are given four tuning forks, the low...

You are given four tuning forks, the lowest frequency of the fork is 300Hz. By striking two tuning forks at a time any of 1, 2, 3, 5, 7 & 8 Hz beat frequencies are heard. The possible frequencies of the other three forks –
(1) 301, 302 & 307
(2) 301, 303 & 308
(3) 300, 304 & 307
(4) 305, 307 & 308

A

1,2 and 3 are correct

B

1 and 2 are correct

C

2 and 4 are correct

D

1 and 3 are correct

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