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

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}.

Related tags

Set-Builder-NotationNatural-NumbersSet-RepresentationSetsSum Of First N Natural NumbersSequences And ProgressionsMathematicsClass 9 Mcq

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