Physics Help-Waves: You have three tuning forks, A, B, and C. Fork B has a frequency of 461 Hz; when A and B are sounded

[Woodsman]

| fa - fb | = fab
| fa - 461 | = 2
→ fa = 459 Hz, 463 Hz

| fc - fb | = fbc
| fc - 461 | = 7
→ fc = 454 Hz, 468 Hz

Possible beat frequencies for A and C are
468 - 459 = 9 Hz }
468 - 463 = 5 Hz } → So the possible beat frequencies are
463 - 454 = 9 Hz } → 5 Hz and 9 Hz, or 7 Hz ± 2 Hz
459 - 454 = 5 Hz }