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If (a_{n+1}-a_n=11) and (a_7=58), what is (a_{17})?

Answer and explanation

Correct answer: 168

Since \(a_{n+1}-a_n=11\), the common difference is \(d=11\). There are 10 term-steps from \(a_7\) to \(a_{17}\), so \(a_{17}=a_7+(17-7)d=58+10\times11=168\). Hence, option D is correct. A value such as 166 results from an error in counting the term difference or multiplying. Exam tip: use \(a_n=a_m+(n-m)d\) when one term of an AP is known.

Related tags

Arithmetic ProgressionCommon DifferenceNth TermClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions Ap

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