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If (a_n=3n+14), what is (n) for (a_n=56)?

Answer and explanation

Correct answer: 14

Given \(a_n=3n+14\) and \(a_n=56\), we get \(3n+14=56\). Subtracting 14 from both sides gives \(3n=42\), so \(n=14\). Hence, 56 is the 14th term of the sequence. If \(n=15\), the term would be \(3\times15+14=59\), not 56. Exam tip: To find the term number, substitute the given value of \(a_n\) into the formula and solve the resulting equation for \(n\).

Related tags

SequencesProgressionsNth TermLinear SequenceAlgebraic EquationsSequences And ProgressionsMathematicsClass 9 Mcq

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