Question 21

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Jambmaths question: 

A binary operation * defined on the set of positive integer is such that that $x*y=2x-3y+2$ for all positive integers x and y. The binary operation is

Option A: 

commutative and closed on the set of positive integers

Option B: 

neither commutative nor closed on the set of positive integers

Option C: 

commutative but not closed on the set of positive integers 

Option D: 

not commutative but closed on the set of positive integers

Jamb Maths Solution: 

Option D

Jamb Maths Topic: 
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