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You are provided with three similar,but ...

You are provided with three similar,but slightly different tuning forks.When A and B are both struck,a beat frequeny of `f_(AB)` is heard.If A and C are both struck,a beat frequency of `f_(AC)` is heard.It was noticed that `f_(AB)` < `f_(AC)` .If B and C are simultaneously struck,what will be the observed beat frequency?

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