A binary operation ⊕ is defines on the set of all positive integers by a
MATHEMATICS
JAMB 1994
A binary operation ⊕ is defines on the set of all positive integers by a ⊕ b = ab for all positive integers a, b. Which of the following properties does NOT hold?
- A. closure
- B. identity
- C. positive
- D. inverse
Correct Answer: D. inverse
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