Problem Solving (PS) | Re: If the operation is defined by xy=(xy)^1/2 for all

I call these "Strange Operator" questions.
We want to evaluate:(5 @ 45) @ 60

Start with(5 @ 45)
(5 @ 45) = √[(5)(45)]
= √225
= 15

So,(5 @ 45) @ 60 =15 @ 60
From here,15 @ 60 = √[(15)(60)]
= √900
= 30

Answer:

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