IMO- Mathematics Olympiad Class 7: Questions 70 - 74 of 1012

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Question number: 70

» Number System

Assertion-Reason▾

Assertion (Ꭺ)

Rational numbers are always closed under division by only non-zero rational numbers

Reason (Ꭱ)

Division by zero is not defined for any rational numbers

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Question number: 71

» Number System

MCQ▾

Question

Which of the following statement is true?

Choices

Choice (4) Response

a.

The product of a negative and a positive integer may be zero

b.

The product of a positive and a negative integer is negative

c.

For all non-zero integers a and b, a×b is always greater than either a or b

d.

None of the above

Question number: 72

» Number System

MCQ▾

Question

Which of the following statement is true?

Choices

Choice (4) Response

a.

The product of two negative integers is positive

b.

For all non-zero integers a and b, a×b is always greater than either a or b

c.

The product of a negative and a positive integer may be zero

d.

None of the above

Question number: 73

» Number System

MCQ▾

Question

Simplify 222[13{42+(568+9¯)}+108]

Choices

Choice (4) Response

a.

89

b.

88

c.

87

d.

90

Question number: 74

» Number System

MCQ▾

Question

The difference of the sum of even numbers and sum of odd numbers between 10 and 20 is________.

Choices

Choice (4) Response

a.

14

b.

15

c.

13

d.

16

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