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Class 9MathematicsSequences and ProgressionsSum of first n natural numbersEasyLevel 10

Let A = {x : x is a natural number and x < 4}. What is A?

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Answer and explanation

Correct answer: {1, 2, 3}

Using the usual school convention, the natural numbers are 1, 2, 3, and so on. The condition x < 4 selects only the natural numbers that are strictly less than 4, namely 1, 2, and 3. The number 4 is excluded because the inequality is strict. Hence A = {1, 2, 3}.

Tags

set-builder-notationnatural-numbersset-representationsetsSum of first n natural numbersSequences and ProgressionsMathematicsClass 9 MCQ

Frequently asked questions

What is the correct answer to this question?

{1, 2, 3}

Why is this the correct answer?

Using the usual school convention, the natural numbers are 1, 2, 3, and so on. The condition x < 4 selects only the natural numbers that are strictly less than 4, namely 1, 2, and 3. The number 4 is excluded because the inequality is strict. Hence A = {1, 2, 3}.

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sum of first n natural numbers.

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