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If the (n)th term of an AP is given by (a_n=4n-1), what is (a_{30})?

Answer and explanation

Correct answer: 119

Given \(a_n=4n-1\), substitute \(n=30\) to find the 30th term: \(a_{30}=4(30)-1=120-1=119\). Therefore, 119 is correct. The value 121 would result from adding 1 instead of subtracting it, so it is not correct. Exam tip: in a direct \(n\)th-term formula, substitute the required term number carefully for \(n\).

Related tags

Arithmetic ProgressionNth TermAp FormulaClass 10 MathematicsSubstitutionFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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