Lesson: Challenging Problem Solving - 13

Advanced Number Properties: Know The Rules

[Page 13 of 37]

Picking Numbers works well on many Number Properties questions, but sometimes it's necessary to know Number Property rules in order to solve a problem. At other times, familiarity with the rules will help get you to the correct answer more efficiently. For the following Roman Numeral question, we will focus on the Number Property rules that are being tested. Review the question and then proceed to the task below.

If the sum of prime numbers x and y is an odd number, which of the following CANNOT be true?

I. y2 is odd
II. x – y is odd
III. is an integer

None
I only
III only
I and II
II and III

This question stem suggests that two Number Properties concepts will be central to solving this problem. What are they?

1:

2:

 
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