GMAT Quantitative Reasoning Practice Test 5

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Question : 44 of 100

Marks: +1, -0

If

∘

denotes an operation such that

r ∘ s=s ∘ r

for all nonzero numbers

r

and

s

, then

∘

could be defined by which of the following equations?
I.

r ∘ s=r+s-r s

II.

r ∘ s=(r+s)-(r-s)

III.

r ∘ s=r \/ s+s \/ r

I only
III only
I and II only
I and III only
I, II, and III

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