Question # 1

Z is the set of integers (Z.*) is a group with a * b = a +b +1, a,b ∈ G.then inverse of a is

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-a

a +1

-1-a

None of these

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If B ={x/x€ Z ^ - 3 < x < 6}, then n (B) =

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5

{-3,-2,-1,0,1,2,3,4,5,6}

8

9

If P = {x/x = p/q where p,q∈ Z and q≠ 0}, then P is the set of

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Irrational numbers

Even numbers

Rational numbers

Whole numbers

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If S = {3,6,9,12.......}, then

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S = Four multiples of 3

S = Set of even numbers

S = Set of prime numbers

S = All multiples of 3

The multiplicative inverse of -1 in the set {1-,1} is

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1

-1

±1

0

Does not exist

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An empty set

Universal set

A singleton set

None of these

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The set which has no proper subset is

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{0}

{}

{∅}

None of these

A - B = ______

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ECAT Mathematics Chapter 2 Set Function and Groups Online Test MCQs With Answers

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