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In simplest form, what type of decimal expansion will 17/120 have?

Answer and explanation

Correct answer: Non-terminating recurring

The governing theorem states that a rational number p/q in lowest terms has a terminating decimal expansion only when the prime factors of q are exclusively 2 and 5. The fraction 17/120 is already reduced because 17 shares no factor with 120. Factor the denominator: 120 = 2^3 × 3 × 5. Since the factor 3 remains, the decimal expansion cannot terminate. A rational number must have either a terminating or a non-terminating recurring decimal expansion, so it cannot be non-recurring. Indeed, long division gives 17/120 = 0.141666..., confirming option B. Option A overlooks the factor 3, while C is associated with irrational decimals.

Related tags

Decimal RepresentationRecurring DecimalsRational NumbersNumber SystemsMathematicsClass 9 Mcq

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