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The fifth term of an arithmetic progression is 18 and its common difference is 3. Which of the following expressions represents its \(n\)th term?

Answer and explanation

Correct answer: \(a_n=3n+3\)

For an AP, \(a_5=a+4d\). Thus, \(18=a+4\times3\) gives \(a=6\), so \(a_n=6+(n-1)3=3n+3\). In option B, the fifth term would be 21. Exam tip: find \(a\) before writing the general term.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceAp FormulaClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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