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If L = {x : x ∈ N and x is a factor of 13}, what type of set is L?

Answer and explanation

Correct answer: Finite set with two elements

The number 13 is prime, so its only positive natural factors are 1 and 13. Thus L = {1, 13}, which has exactly two elements. It is therefore a finite set with two elements, not empty, not a singleton, and certainly not infinite. The defining property of a prime number is useful here because it has exactly two positive factors.

Related tags

SetsPrime NumbersFactorsNumber SystemsMathematicsClass 9 Mcq

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