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If (a_n=4n^2-n) then what is (a_4:a_2)?

Answer and explanation

Correct answer: 30:7

Given a_n=4n²−n, a_4=4(4²)−4=64−4=60 and a_2=4(2²)−2=16−2=14. Hence, a_4:a_2=60:14=30:7. Option A uses the correct terms but does not simplify the ratio. Exam tip: after finding a ratio, divide both terms by their greatest common factor to write it in simplest form.

Related tags

SequencesProgressionsExplicit RuleRatioClass 9 MathematicsExplicit Or General RuleSequences And ProgressionsMathematics

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