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If aₙ = n³ + n², what is a₅ : a₃?

Answer and explanation

Correct answer: 25 : 6

The governing concept is evaluating an explicit rule at two positions and then simplifying the resulting ratio. For n = 5, a₅ = 5³ + 5² = 125 + 25 = 150. For n = 3, a₃ = 3³ + 3² = 27 + 9 = 36. Thus a₅ : a₃ = 150 : 36. The greatest common divisor of 150 and 36 is 6, so dividing both parts by 6 gives 25 : 6. Therefore option B is the simplified answer. Option A is the correct unsimplified ratio, but the question asks for the ratio in standard simplified form. Option C reverses the order to a₃ : a₅, and option D incorrectly uses only selected powers instead of evaluating the whole formula at both indices.

Related tags

Explicit-RuleRatioSimplificationSequencesSequences And ProgressionsExplicit Or General RuleMathematicsClass 9 Mcq

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