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MCQ Tutorial - Mathematics->Algebra

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16.) If the set G={1,ω,ω2} is an abelian group with respect to  multiplication, then
what is the inverse of ω?
Options are:
A.) ω
B.) 1/ω
C.) ω2
D.) 1
                        
17.) Which from the following set has closure property with respect to addition?
Options are:
A.) {1,1}
B.) {0}
C.) {1,-1}
D.) {1}
18.) Which from the following set has closure property with respect to multiplication?
Options are:
A.) {-1,-1}
B.) {-1}
C.) {1,-1}
D.) {0,-1}
19.) If a function  ƒ: A→B is such that Ran ƒ ≠ B, then ƒ is a/an?
Options are:
A.) surjective
B.) into function
C.) goto function
D.) onto function
20.) If a function  : A→B is such that Ran  = B, then  is a/an?
Options are:
A.) goto function
B.) into function
C.) surjective
D.) onto function
                        
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