If A = q ? r, B = r ? s, and C = q ? s, what is the value of A ? (B ? C)?【小站备考】

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If A = q ? r, B = r ? s, and C = q ? s, what is the value of A ? (B ? C)?

A.−r

B.0

C.1

D.q + r

E.2(q − r)

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