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.

Quantitative Aptitude Reasoning English General Knowledge Picture Patterns

Jobs in Pakistan Induction process Test Prep Sections Practice MCQs Admission Tests Test Sections Success on Tests Study in USA Pak Universities Employment ISSB Preliminaries Articles and Essays Schools & Colleges Study Abroad Career News

Arithmetic Geometry Data Interpretation Problem Solving Data Sufficiency Quant. Comparison

English Vocabulary English Correction Antonyms Synonyms Analogies Fill in the Blanks Critical Reading Text Completion

Number Series Picture Pattern Critical Reasoning Analytical Reasoning

Writing

Physics Chemistry Biology Mathematics Pak Penal Code Islamic Hudood Laws

Problem Solving Strategies Applied Arithmetic Algebra Advance Algebra Problem Solving 1 Problem Solving 2 Practice MCQs Intermediate Module Estimation And Elimination Answer Choice Elimination Which Of The Following Must Be Question The Roman Numeral Question, continued Avoiding Test Traps Unlikely Answer Choices Diagrams And Visualization Intermediate Next Steps

MCQ with question Explanations Scholarships and Financial Aid

Lesson: Intermediate Problem Solving - 13

The "Must Be" Question

Video Lessons and 10 Fully Explained Grand Tests

Current Menu

More for You

Arithmetic

Problem Solving

CSS Exam

You may be interested in

Colleges in cities of Punjab

Colleges in Bahawalpur

Speak and Succeed

Study in UK

ISSB Group Planning Tasks

SAt Subject Mathematics

HU: Hamdard University

GIKI: Information Technology Degrees

About us

Quick Test Prep

Study Abroad

Lesson: Intermediate Problem Solving - 13

The "Must Be" Question

Video Lessons and 10 Fully Explained Grand Tests

Current Menu

Main Menu (Click/Tap to Open)

Current Menu

Quantitative

Verbal

Logical/Reasoning

Writing

Subjects

problem Solving

More for You

Arithmetic

Problem Solving

CSS Exam

You may be interested in

About us

Quick Test Prep

Study Abroad