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Which is the correct rule for the (n)th term of (108,99,90,\ldots)?

Answer and explanation

Correct answer: \(a_n=117-9n\)

This is an arithmetic progression with first term \(a_1=108\) and common difference \(d=99-108=-9\). Thus, \(a_n=a_1+(n-1)d=108+(n-1)(-9)=117-9n\). In option B, putting \(n=1\) gives 99, so it does not match the first term. Exam tip: always test an nth-term rule by substituting \(n=1\).

Related tags

SequencesNth TermArithmetic ProgressionCommon DifferenceLinear RuleSequences And ProgressionsMathematicsClass 9 Mcq

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