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Which number will have a non-terminating non-recurring decimal expansion?

Answer and explanation

Correct answer: ( \sqrt{18} )

The direct answer is option C, √18. A decimal expansion is non-terminating and non-recurring when the number is irrational. First simplify √18: since 18 = 9 × 2, √18 = √9 × √2 = 3√2. The number √2 is irrational, and multiplying it by the non-zero rational number 3 keeps it irrational. Therefore √18 has a decimal expansion that never ends and never repeats in a fixed pattern. Option A, 5/6, is rational; its decimal is 0.8333..., which is non-terminating but recurring. Option B, 0.875, is already a terminating decimal and equals 7/8. Option C, √18, is irrational and therefore has the required non-terminating, non-recurring expansion. Option D, 2, is an integer, and every integer has a terminating decimal representation, such as 2.0. The key distinction is that a non-terminating decimal may be recurring or non-recurring; only an irrational number gives a non-terminating non-recurring decimal. Remember: rational numbers have terminating or recurring decimals, while irrational numbers have non-terminating non-recurring decimals.

Related tags

Number-SystemsIrrational-NumbersDecimal-Expansion

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