A binary operation * is defined on the set of positive integers is such x*y...
MATHEMATICS
JAMB 2008
A binary operation * is defined on the set of positive integers is such x*y = 2x-3y+2 for all positive integers x and y. The binary operation is
- A. commutative and close on the set of positive integers
- B. neither commutative nor closed on the set of ppositive integers
- C. commutative but not closed on the set of positive integers
- D. not cummutative but closed on the set of positive integers
Correct Answer: B. neither commutative nor closed on the set of ppositive integers
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