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Let W = {x : x ∈ N and x is less than the smallest two-digit number}. What is its roster form?

Answer and explanation

Correct answer: W = {1, 2, 3, 4, 5, 6, 7, 8, 9}

The smallest two-digit number is 10. The question asks for natural numbers strictly less than 10, and the stated convention is N = {1, 2, 3, ...}. Therefore the members are 1, 2, 3, 4, 5, 6, 7, 8 and 9. Zero is excluded because it is not in the given N, while 10 is excluded because the condition says less than 10. Thus option A is correct.

Related tags

SetsNatural NumbersRoster FormNumber ClassificationGeneral Chapter PracticeNumber SystemsMathematicsClass 9 Mcq

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