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If (x) is a whole number and (x<4), what is the solution set?

Answer and explanation

Correct answer: ({0,1,2,3})

The direct answer is option A: {0,1,2,3}. A whole number is a non-negative integer: 0,1,2,3,4, and so on. The condition x<4 means x must be smaller than 4, so list the whole numbers beginning at 0 and stop before 4: 0,1,2,3. Thus 4 is excluded because the inequality is strict. A is correct. B, {1,2,3,4}, wrongly omits 0 and includes 4. C, {0,1,2,3,4}, also includes 4, which is not allowed. D, {4,5,6}, contains numbers that are equal to or greater than 4, so none of them satisfies x<4. The word whole is important: whole numbers include 0, unlike positive counting numbers in conventions that begin with 1. The answer is finite here because the domain is restricted to whole numbers. Memory cue: for x<4, write the whole numbers from 0 up to, but not including, 4.

Related tags

Linear InequalitiesWhole NumbersSolution Set

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