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What is the correct meaning of [12, 12] on the number line?

Answer and explanation

Correct answer: Only a closed point at 12

A closed interval [a, b] contains every number from a through b, including both endpoints. When the two endpoints are equal, as in [12, 12], there is no length between them and the only possible member is 12 itself. On a number line this set is represented by one closed point at 12, because the square brackets indicate inclusion. It is a singleton set, not an interval containing nearby numbers and not an empty set. Therefore option A is correct. An open circle would exclude 12, the whole line contains infinitely many other values, and “no solution” would mean that the set had no elements at all.

Related tags

Linear InequalitiesSingleton IntervalClosed EndpointClass 11Representation On Number LineMathematicsClass 11 Mcq

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