In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz . When tension in B is slightly decreased, the beat frequency increases to 7 Hz . If the frequency of A is 530 Hz , the original frequency of B will be:

1. A. 524 Hz
2. B. 536 Hz
3. C. 537 Hz
4. D. 523 Hz

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