Loading...

Lesson: Intermediate Problem Solving - 13

The "Must Be" Question

[Page 13 of 27]
On questions that ask "Which of the following must be true?" or "Which of the following must be false?", use Picking Numbers to eliminate answer choices.

The key to these types of problems is to look for a number that will disqualify the answer choice:

  • If the question asks for the answer choice that must always be true, try to find a number that will make the answer choices false.
  • If the question asks for the answer choice that must always be false, try to find numbers that will make the answer choices true.
Review the following question. For each answer choice, pick numbers that will allow you to eliminate the choice. To see the numbers we've picked and the result, CLICK ON EACH ANSWER CHOICE. Click Continue when you are done.

If m and n are integers such that mn = 500, which of the following statements must be true?

m + n > 0
Either m or n is a multiple of 10.
m + n is odd
If m is odd, then n is even.
If m is even, then n is odd


Back Next

Next to display next topic in the chapter.

Video Lessons and 10 Fully Explained Grand Tests

Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.

More for You
All in this Category

You may be interested in

Colleges in Lahore

Find a comprehensive list of major ...

Colleges in Sukkur

Find a comprehensive list of major ...

Books for Test Preparation

Find Books for Test Preparation. A ...

Study in Pakistani University or College

Detailed informationabout Study in ...

CSS Exam

All about the preliminary requireme ...

ISSB Tests

Learn about ISSB - Armed forces rec ...

Universities in Lahore

A comprehensive list of major unive ...

PU University of the Punjab

The oldest university in Pakistan - ...